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Exercism Learning Free, open-source platform to practice coding across dozens of languages with optional mentorship. Nonprofit Login Required Mobile Limited W3Schools Learning Beginner-friendly web development tutorials with an in-browser code editor. Company Login Not required Mobile Supported LeetCode Development The go-to site for coding-interview practice Company Login Optional Mobile Supported Khan Academy Learning Free lessons from math to science Nonprofit Login Optional Mobile Supported Codewars Learning Practice coding by solving ranked challenges called kata. Company Login Required Mobile Limited Frontend Mentor Learning Practice front-end skills by building real projects from professional designs. Company Login Optional Mobile Supported Quizlet Learning A flashcard and study tool for memorising terms, definitions, and facts. Company Login Optional Mobile App recommended HackerRank Learning A practice platform for coding challenges, skill certifications, and interview prep. Company Login Required Mobile Supported