Best of freeCodeCamp — February 2026

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   Article

   freeCodeCamp·13w

   Harvard CS50 2026 – Free Computer Science University Course

   Harvard's CS50 2026 course is now available as a free 25-hour video series covering fundamental computer science concepts. The course teaches algorithmic thinking and problem-solving through multiple programming languages including C, Python, SQL, HTML, CSS, and JavaScript. Topics span algorithms, data structures, memory management, web programming, and a new section on artificial intelligence's impact on computer science. Taught by David J. Malan, the course is designed for beginners with no prior programming experience.

   547

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   Article

   freeCodeCamp·10w

   Master Kubernetes Through Production-Ready Practice

   A 6-hour hands-on Kubernetes course posted on freeCodeCamp's YouTube channel, developed by Saiyam Pathak. It covers deploying a cloud-native microservices stack from scratch, including Kubernetes architecture (Control Plane, Worker Nodes, CRI/CNI/CSI), Gateway API for traffic management, CloudNativePG for PostgreSQL, cert-manager for HTTPS, and full-stack observability with Prometheus and Grafana. The course targets production-grade deployments rather than isolated command memorization.

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3. 3
   Article

   freeCodeCamp·12w

   The Modern React Data Fetching Handbook: Suspense, use(), and ErrorBoundary Explained

   React's Suspense, use() API, and Error Boundaries provide a declarative alternative to traditional useEffect-based data fetching. Instead of fetch-on-render patterns that create waterfalls and require manual loading states, Suspense enables render-as-you-fetch coordination. The use() hook reads promises during render, pausing until resolved, while Error Boundaries catch failures gracefully. This pattern eliminates unnecessary state management, conditional rendering logic, and sequential request chains—resulting in cleaner, more maintainable code with better UX through independent component loading and recoverable errors.

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   Article

   freeCodeCamp·12w

   Build a Production-Ready Pipeline with Docker, CI/CD & Hostinger

   A comprehensive 4-hour video course teaches how to containerize a full-stack React, Go, and MongoDB application using Docker and Docker Compose. The tutorial covers creating separate development and production environments, pushing images to DockerHub, deploying to Hostinger both manually and through terminal, and setting up automated CI/CD deployment using GitHub Actions. The course progresses from local development through containerization to production deployment with automated pipelines.

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   Video

   freeCodeCamp·13w

   Why Vite needs a new bundler - from Evan You himself

   Evan You explains why Vite currently uses two bundlers: esbuild for speed during development and Rollup for production builds. Esbuild is extremely fast but has limitations in chunk splitting algorithms for production. Rollup excels at chunk splitting but is slower because it's written in JavaScript. This dual-bundler approach creates a dilemma that necessitates exploring a new bundler solution.

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   Article

   freeCodeCamp·11w

   How to Build Your Own Circuit Breaker in Spring Boot – and Really Understand Resilience4j

   Learn how circuit breakers work by building one from scratch in Spring Boot. The tutorial walks through implementing a thread-safe state machine with explicit failure tracking, scheduler-driven recovery, and clear CLOSED/OPEN/HALF_OPEN transitions. Covers concurrency guarantees, failure classification, Spring integration via @Configuration, and when to use custom implementations versus Resilience4j. Includes complete working code with atomic counters, synchronized state transitions, and ScheduledExecutorService for time-based recovery.

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   Article

   freeCodeCamp·10w

   Learn Python and Build Autonomous Agents

   A 6-hour freeCodeCamp course covering Python fundamentals through AI agent development. The curriculum spans four modules: Python essentials (variables, loops, functions), data science foundations (NumPy, Pandas, SQLite), API development (REST APIs, FastAPI), and AI/LLM integration including ChatGPT, Gemini, and open-source HuggingFace models for building autonomous agents.

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   Article

   freeCodeCamp·13w

   How to Dockerize Your Application and Deploy It

   Docker packages applications with all dependencies into containers that run consistently across environments. This guide walks through containerizing a FastAPI-based LogAnalyzer Agent by writing a Dockerfile, building an image, handling environment variables securely, testing locally, and deploying to Sevalla cloud platform via DockerHub registry. The process transforms a local Python application into a production-ready service.

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