freeCodeCamp.org

Master the fundamentals of C programming from scratch. Learn core concepts like variables, control flow, functions, pointers, and file I/O through hands-on projects, setting up your environment on Windows or macOS to build a strong foundation in software development.

Master the sliding window algorithm to solve complex subarray and substring problems efficiently. Learn to transition from brute-force O(N^2) to optimal O(N) time complexity, preparing you to ace competitive programming and top-tier technical interviews with confidence.

Master core AWS services, cloud security, architecture, and billing models to ace the AWS Certified Cloud Practitioner (CLF-C02) exam. This comprehensive, structured guide provides foundational cloud knowledge, practical service overviews, and key exam preparation strategies for success.

Master Figma from the ground up. Learn essential UI/UX design tools, style guides, auto layout, and responsive constraints. Build real-world projects including travel sites, food delivery apps, and 3D web elements to launch your professional design portfolio.