Online Learning
Top-university open courses and skill platforms — many are free to audit.
CourseraStructured courses with top universities and companies.coursera.org
freeCodeCampA free coding curriculum with project certifications.freecodecamp.org
UdemyA skills-course marketplace, often deeply discounted.udemy.com
AnkiSpaced-repetition flashcards — the ultimate for vocabulary.apps.ankiweb.net
Open CultureAggregates free courses, ebooks and films from across the web.openculture.com