Learn CS. Discover the World.

advanced

Free Course

Apache Airflow Deep Dive

Beyond the basics: dynamic DAGs, sensors, custom operators, and production Airflow deployments.

📖 3 lessons 🎯 None

Start Learning

advanced

Free Course

Apache Cassandra — Wide-Column Store

Distributed wide-column NoSQL: Cassandra ring topology, partitioning, and tunable consistency.

📖 3 lessons 🎯 None

Start Learning

advanced

Free Course

Apache Druid — Real-Time OLAP

Sub-second analytical queries on streaming + historical data with Apache Druid.

📖 3 lessons 🎯 None

Start Learning

advanced

Free Course

Apache Flink — Real-Time Stream Processing

Stateful stream processing with Apache Flink: windows, watermarks, and exactly-once semantics.

📖 3 lessons 🎯 None

Start Learning

advanced

Free Course

Apache Kafka — Event Streaming Platform

Build real-time, event-driven systems with Kafka topics, producers, consumers, and Kafka Streams.

📖 3 lessons 🎯 Backend development, Distributed systems basics

Start Learning

advanced

Free Course

Apache Spark — Big Data Processing

Process massive datasets at scale with Spark SQL, DataFrames, and Spark Streaming.

📖 3 lessons 🎯 Python or Scala, SQL basics

Start Learning

advanced

Free Course

API Gateway Patterns

API gateway design: Kong, Tyk, AWS API Gateway. Routing, auth, rate limiting, and BFF patterns.

📖 3 lessons 🎯 None

Start Learning

intermediate

Free Course

Astro — The Content-Focused Framework

Build blazing-fast content sites with Astro: islands architecture, partial hydration, and zero-JS by default.

📖 3 lessons 🎯 None

Start Learning

advanced

Free Course

Authentication & OAuth 2.1

Production auth patterns: OAuth 2.1, OIDC, JWTs, refresh tokens, and session management without the gotchas.

📖 3 lessons 🎯 None

Start Learning

advanced

Free Course

Browser Internals — V8 & Rendering

How browsers work: V8 JIT, the rendering pipeline, layout, paint, composite, and event loop.

📖 3 lessons 🎯 None

Start Learning

advanced

Free Course

Chaos Engineering

Break things on purpose: chaos engineering principles, Chaos Mesh, and resilience testing.

📖 3 lessons 🎯 None

Start Learning

advanced

Free Course

ClickHouse — Analytics Database

OLAP at scale: ClickHouse column store, merge tree engines, and sub-second analytics queries.

📖 3 lessons 🎯 None

Start Learning

advanced

Free Course

Clojure — Lisp on the JVM

Modern Lisp with immutable data structures, REPL-driven development, and the JVM ecosystem.

📖 3 lessons 🎯 None

Start Learning

intermediate

Free Course

Cloud Computing with AWS

AWS fundamentals: EC2, S3, Lambda, RDS, and IAM. Deploy real applications to the cloud.

📖 4 lessons 🎯 linux-bash, docker-containers

Start Learning

advanced

Free Course

Compilers — How Programming Languages Work

Lexing, parsing, AST, semantic analysis, IR, optimization, and code generation. Build a small compiler.

📖 3 lessons 🎯 None

Start Learning

advanced

Free Course

Computer Graphics & WebGL

Rasterization, shaders, lighting models, and 3D rendering with WebGL and Three.js.

📖 3 lessons 🎯 None

Start Learning

intermediate

Free Course

Computer Networking Fundamentals

How the internet works: TCP/IP, DNS, HTTP, TLS, and network protocols. Essential for backend and security.

📖 3 lessons 🎯 None

Start Learning

advanced

Free Course

Computer Vision with PyTorch

Deep learning for images: CNNs, object detection, segmentation, and modern vision models.

📖 3 lessons 🎯 Deep Learning fundamentals, Python

Start Learning

intermediate

Free Course

Cybersecurity Fundamentals

Core security concepts: OWASP Top 10, encryption, authentication, network security, and ethical hacking basics.

📖 3 lessons 🎯 linux-bash, apis-rest

Start Learning

advanced

Free Course

Data Engineering Pipelines

Build data pipelines with Python, Airflow, and Spark. ETL, data lakes, and real-time streaming.

📖 4 lessons 🎯 python-ai, sql-databases, docker-containers

Start Learning

advanced

Free Course

Data Mesh Architecture

Decentralized data ownership: data mesh principles, data products, and federated governance.

📖 3 lessons 🎯 None

Start Learning

intermediate

Free Course

Data Structures & Algorithms

Core computer science: arrays, trees, graphs, sorting, and searching. Essential for interviews.

📖 4 lessons ⏱ 6h 🎯 python-ai

Start Learning

advanced

Free Course

Database Internals — Storage Engines

B-trees, LSM-trees, WAL, MVCC, and how databases actually store and retrieve data.

📖 3 lessons 🎯 None

Start Learning

intermediate

Free Course

dbt — Data Build Tool

Transform data in your warehouse using dbt: models, tests, snapshots, and analytics engineering.

📖 3 lessons 🎯 None

Start Learning

advanced

Free Course

Deep Learning & Neural Networks

Neural networks, backpropagation, CNNs, and RNNs with PyTorch. From theory to practice.

📖 4 lessons ⏱ 1h 🎯 machine-learning

Start Learning

intermediate

Free Course

Design Patterns & Low-Level Design

SOLID principles, Gang of Four design patterns, and low-level design interviews. Required for senior engineering roles …

📖 4 lessons ⏱ 1h 🎯 data-structures-algorithms, python-ai

Start Learning

intermediate

Free Course

DevOps & CI/CD Pipelines

Automate deployments with GitHub Actions, CI/CD pipelines, and infrastructure as code.

📖 3 lessons 🎯 git-version-control, docker-containers

Start Learning

intermediate

Free Course

Discrete Mathematics for CS

Sets, logic, combinatorics, graph theory, and proofs — the math behind every CS topic.

📖 3 lessons 🎯 None

Start Learning

intermediate

Free Course

Docker & Containers

Containerize applications with Docker. Build, ship, and run anywhere.

📖 3 lessons ⏱ 3h 🎯 linux-bash

Start Learning

advanced

Free Course

Elixir & Phoenix — Concurrent Web

Build massively concurrent apps with Elixir, the BEAM VM, and the Phoenix LiveView framework.

📖 3 lessons 🎯 None

Start Learning

advanced

Free Course

Ethical Hacking & Penetration Testing

Learn offensive security: reconnaissance, exploitation, and defensive thinking with hands-on labs.

📖 3 lessons 🎯 Cybersecurity basics, Linux

Start Learning

intermediate

Free Course

Flutter — Cross-Platform Mobile Apps

Build beautiful, native-feeling apps for iOS and Android with Flutter and Dart.

📖 3 lessons 🎯 Programming experience

Start Learning

beginner

Free Course

Git & GitHub — Version Control for Developers

Master Git for version control and GitHub for collaboration. Essential for every developer.

📖 3 lessons ⏱ 2h 🎯 None

Start Learning

intermediate

Free Course

Go — Cloud-Native Backend Development

Learn Go for building fast, concurrent cloud-native services. Covers goroutines, channels, REST APIs, and deploying to …

📖 4 lessons ⏱ 1h 🎯 python-ai, apis-rest

Start Learning

intermediate

Free Course

GraphQL — Modern API Design

Design and build flexible, type-safe APIs with GraphQL, Apollo, and modern tooling.

📖 3 lessons 🎯 REST API basics

Start Learning

advanced

Free Course

gRPC & Protocol Buffers

Build high-performance RPC services with gRPC, Protocol Buffers, and streaming.

📖 3 lessons 🎯 None

Start Learning

advanced

Free Course

Haskell — Functional Programming

Pure functional programming with Haskell: types, monads, lazy evaluation, and category theory basics.

📖 3 lessons 🎯 None

Start Learning

beginner

Free Course

Java — From Zero to Enterprise

Java fundamentals through object-oriented design, collections, streams, and Spring Boot — the language powering most …

📖 5 lessons ⏱ 1h 🎯 None

Start Learning

intermediate

Free Course

Kotlin & Android Development

Build Android apps with Kotlin — Google’s preferred language. Covers Jetpack Compose, ViewModels, Room database, …

📖 4 lessons ⏱ 1h 🎯 java-fundamentals

Start Learning

advanced

Free Course

Kubernetes — Container Orchestration at Scale

Master Kubernetes for deploying, scaling, and managing containerized applications in production.

📖 3 lessons 🎯 Docker & Containers

Start Learning

intermediate

Free Course

LangChain — Build LLM Applications

Build production LLM apps with LangChain: chains, agents, tools, memory, and retrieval.

📖 3 lessons 🎯 Python, NLP & LLM basics

Start Learning

beginner

Free Course

Linux & Bash — Command Line for Developers

Master the Linux command line and Bash scripting. Essential for backend, DevOps, and AI work.

📖 3 lessons ⏱ 6h 🎯 None

Start Learning

advanced

Free Course

LLM Fine-Tuning with LoRA & QLoRA

Fine-tune large language models efficiently with LoRA, QLoRA, and the HuggingFace ecosystem.

📖 3 lessons 🎯 None

Start Learning

intermediate

Free Course

Logging at Scale — ELK & Loki

Structured logging, log aggregation with the ELK stack and Loki, and log-based debugging.

📖 3 lessons 🎯 None

Start Learning

intermediate

Free Course

Machine Learning with Python

Practical machine learning with scikit-learn, pandas, and numpy. Build real prediction models.

📖 4 lessons ⏱ 19h 🎯 python-ai

Start Learning

advanced

Free Course

Microservices — Patterns & Practices

Design, build, and operate distributed systems using microservices patterns and best practices.

📖 3 lessons 🎯 System Design basics

Start Learning

advanced

Free Course

MLOps — Machine Learning in Production

Take ML models from notebook to production: tracking, deployment, monitoring, and CI/CD.

📖 3 lessons 🎯 Machine Learning basics

Start Learning

advanced

Free Course

Mobile App Architecture — Clean & Scalable

Architect production mobile apps with MVVM, Clean Architecture, modular design, and dependency injection.

📖 3 lessons 🎯 Mobile development experience

Start Learning

intermediate

Free Course

Modern JavaScript — ES6 to Async/Await

Deep dive into modern JavaScript: arrow functions, destructuring, promises, async/await, and modules.

📖 4 lessons ⏱ 3h 🎯 web-fundamentals

Start Learning

intermediate

Free Course

MongoDB & NoSQL Databases

Document databases done right: schema design, queries, aggregations, and scaling with MongoDB.

📖 3 lessons 🎯 Database fundamentals

Start Learning

advanced

Free Course

Multimodal Models — CLIP & BLIP

Models that bridge vision and language: CLIP, BLIP, and multimodal embeddings for search and generation.

📖 3 lessons 🎯 None

Start Learning

intermediate

Free Course

Next.js — Full-Stack React Framework

Build modern, server-rendered React apps with App Router, Server Components, and Vercel deployment.

📖 3 lessons 🎯 React.js basics

Start Learning

advanced

Free Course

NLP & Large Language Models

Natural language processing, transformers, and building applications with LLMs like GPT and Claude.

📖 3 lessons 🎯 machine-learning, deep-learning

Start Learning

intermediate

Free Course

Node.js — Server-Side JavaScript

Build production servers, APIs, and tools with Node.js, Express, and modern async patterns.

📖 3 lessons 🎯 JavaScript fundamentals

Start Learning

advanced

Free Course

OpenTelemetry & Distributed Tracing

Instrument microservices with OpenTelemetry: traces, metrics, logs, and the unified observability stack.

📖 3 lessons 🎯 None

Start Learning

advanced

Free Course

Operating Systems Concepts

Processes, threads, scheduling, virtual memory, file systems, and how Linux really works.

📖 3 lessons 🎯 None

Start Learning

intermediate

Free Course

PostgreSQL — Advanced Queries & Performance

Master Postgres: indexing, query planning, JSONB, window functions, and tuning for scale.

📖 3 lessons 🎯 SQL basics

Start Learning

intermediate

Free Course

Prometheus & Grafana

Metrics-based monitoring: Prometheus scraping, PromQL queries, and Grafana dashboards.

📖 3 lessons 🎯 None

Start Learning

intermediate

Free Course

Prompt Engineering & AI Agents

Master prompt design, chain-of-thought reasoning, and build autonomous AI agents with LangChain and the OpenAI API.

📖 5 lessons ⏱ 1h 🎯 python-ai, nlp-and-llms

Start Learning

beginner

Free Course

Python for AI — Zero to Agent

Complete Python course for beginners targeting AI/ML applications. No prior programming experience needed.

📖 6 lessons ⏱ 1h 🎯 None

Start Learning

intermediate

Free Course

RabbitMQ — Message Queues

Decouple services with RabbitMQ: queues, exchanges, routing, and consumer patterns.

📖 3 lessons 🎯 None

Start Learning

intermediate

Free Course

React Native — Cross-Platform Mobile

Build native iOS and Android apps from one JavaScript codebase using React Native, Expo, and modern patterns.

📖 3 lessons 🎯 None

Start Learning

intermediate

Free Course

React.js — Modern UI Development

Build modern web UIs with React. Components, hooks, state management, and real projects.

📖 4 lessons ⏱ 15h 🎯 web-fundamentals, javascript-modern

Start Learning

advanced

Free Course

Recommendation Systems

Collaborative filtering, matrix factorization, neural recommenders, and ranking with two-tower models.

📖 3 lessons 🎯 None

Start Learning

intermediate

Free Course

Redis — Caching & In-Memory Data

Use Redis for caching, sessions, queues, leaderboards, and pub/sub at scale.

📖 3 lessons 🎯 Backend development basics

Start Learning

advanced

Free Course

Reinforcement Learning

Agents that learn from rewards: Q-learning, policy gradients, and deep RL with PPO.

📖 3 lessons 🎯 None

Start Learning

intermediate

Free Course

REST APIs — Design and Build

Design and build REST APIs with Python FastAPI. Authentication, databases, and deployment.

📖 3 lessons ⏱ 23h 🎯 python-ai, sql-databases

Start Learning

advanced

Free Course

Rust — Systems Programming Without Fear

Learn memory-safe systems programming with Rust: ownership, borrowing, and zero-cost abstractions.

📖 3 lessons 🎯 Programming experience in any language

Start Learning

advanced

Free Course

Scala for Backend Development

Hybrid functional and OO programming on the JVM with Scala 3, Akka, and Play.

📖 3 lessons 🎯 None

Start Learning

intermediate

Free Course

SEO Engineering for Developers

Technical SEO: crawlability, sitemaps, structured data, Core Web Vitals, and search Console.

📖 3 lessons 🎯 None

Start Learning

advanced

Free Course

Site Reliability Engineering (SRE)

SLIs, SLOs, error budgets, on-call rotations, and the SRE mindset for production reliability.

📖 3 lessons 🎯 None

Start Learning

intermediate

Free Course

Snowflake — Cloud Data Warehouse

Snowflake architecture, virtual warehouses, semi-structured data, and cost optimization.

📖 3 lessons 🎯 None

Start Learning

intermediate

Free Course

Solid.js — Fine-Grained Reactivity

Reactive primitives without a virtual DOM: signals, effects, and the performance-first Solid.js framework.

📖 3 lessons 🎯 None

Start Learning

advanced

Free Course

Solidity — Smart Contracts on Ethereum

Build, test, and deploy decentralized apps with Solidity, Hardhat, and the EVM ecosystem.

📖 3 lessons 🎯 Programming experience

Start Learning

intermediate

Free Course

Speech Recognition with Whisper

OpenAI Whisper: speech-to-text, language detection, diarization, and production STT pipelines.

📖 3 lessons 🎯 None

Start Learning

beginner

Free Course

SQL & Databases — From Zero to Query Master

Learn SQL from scratch — SELECT to JOIN to subqueries. Work with real databases.

📖 4 lessons ⏱ 15h 🎯 None

Start Learning

intermediate

Free Course

Stable Diffusion — AI Image Generation

Generate, control, and customize AI images with Stable Diffusion, ControlNet, and LoRA.

📖 3 lessons 🎯 Python basics

Start Learning

intermediate

Free Course

Svelte & SvelteKit — Compiled UI

Write less code with Svelte 5: runes, reactivity, and SvelteKit for full-stack apps.

📖 3 lessons 🎯 None

Start Learning

intermediate

Free Course

Swift & iOS Development

Build native iPhone apps with Swift, SwiftUI, and modern Apple frameworks.

📖 3 lessons 🎯 Programming experience

Start Learning

advanced

Free Course

System Design — Scalability and Architecture

Design scalable systems: load balancers, caches, databases, and microservices. Essential for senior roles.

📖 4 lessons 🎯 sql-databases, apis-rest, docker-containers

Start Learning

intermediate

Free Course

Tailwind CSS v4 — Utility-First Styling

Master Tailwind CSS v4: the @theme directive, design tokens in CSS, and the new lightning-fast Rust engine.

📖 3 lessons 🎯 None

Start Learning

advanced

Free Course

Terraform — Infrastructure as Code in Depth

Provision and manage cloud infrastructure declaratively with Terraform across AWS, GCP, and Azure.

📖 3 lessons 🎯 Cloud Computing basics

Start Learning

intermediate

Free Course

Test-Driven Development with Jest

Build reliable software with TDD, unit/integration testing patterns, and Jest in JavaScript/TypeScript.

📖 3 lessons 🎯 JavaScript or TypeScript

Start Learning

advanced

Free Course

Theory of Computation

Automata, regular languages, context-free grammars, Turing machines, and computational complexity.

📖 3 lessons 🎯 None

Start Learning

intermediate

Free Course

Time-Series with InfluxDB

Time-series workloads: InfluxDB, Flux queries, downsampling, and IoT pipelines.

📖 3 lessons 🎯 None

Start Learning

intermediate

Free Course

TypeScript — JavaScript with Superpowers

Add static typing to JavaScript with TypeScript. Fewer bugs, better tooling, production-ready code.

📖 3 lessons ⏱ 5h 🎯 javascript-modern

Start Learning

advanced

Free Course

Vector Databases & RAG

Retrieval-Augmented Generation: embeddings, vector search, Pinecone/Weaviate, and production RAG.

📖 3 lessons 🎯 LLM basics, Python

Start Learning

intermediate

Free Course

Vue.js — Progressive Frontend Framework

Master Vue 3, the Composition API, and the modern Vue ecosystem for reactive web UIs.

📖 3 lessons 🎯 JavaScript fundamentals, HTML/CSS

Start Learning

intermediate

Free Course

Web Accessibility (WCAG 2.2)

Build for everyone: semantic HTML, ARIA, keyboard navigation, screen readers, and WCAG 2.2 AA compliance.

📖 3 lessons 🎯 None

Start Learning

beginner

Free Course

Web Development Fundamentals

Learn HTML, CSS, and JavaScript from scratch. Build real websites by the end of the course.

📖 4 lessons ⏱ 1h 🎯 None

Start Learning

intermediate

Free Course

Web Performance — Core Web Vitals

Master LCP, INP, and CLS: profiling, image optimization, code splitting, and the rendering critical path.

📖 3 lessons 🎯 None

Start Learning

advanced

Free Course

WebAssembly — High-Performance Web

Run native-speed code in the browser with WebAssembly, Rust, and modern WASM toolchains.

📖 3 lessons 🎯 JavaScript, Some C/C++ or Rust

Start Learning

intermediate

Free Course

WebSockets & Real-Time Backend

Build real-time backends with WebSockets, Socket.IO, scaling, and presence tracking.

📖 3 lessons 🎯 None

Start Learning

advanced

Free Course

Zig — Modern Systems Programming

Zig: a manual-memory systems language with compile-time evaluation and no hidden control flow.

📖 3 lessons 🎯 None

Start Learning