JavaScript.info

The Modern JavaScript Tutorial is a widely recommended, systematic free JavaScript textbook — from variables to the event loop, prototypes, and modules, with tasks and tests per chapter. It's more rigorous than most paid courses, with an official Chinese translation.

1. Read it sequentially as your main textbook and actually do the tasks in each chapter — reading isn't knowing.
2. If you already know the basics, use the table of contents to fill gaps; the event loop, async, and prototype chapters are the high-value ones.
3. The Chinese edition lives at zh.javascript.info, chapter-matched to the English one.
4. It also earns its keep as a long-term reference for specific syntax.

• A complete curriculum from zero to advanced in one line
• Exercises and tests per chapter
• An officially maintained Chinese edition
• Content tracks language updates — new ES features keep landing