Một số nguồn học JavaScript miễn phí:
JS cơ bản https://www.codehub.vn/Hoc-JavaScript-Co-Ban
https://medium.com/javascript-scene/learn-javascript-b631a4af11f2
http://exploringjs.com/es6/index.html
https://learnjavascript.online/app.html
https://news.ycombinator.com/item?id=18814416
https://eloquentjavascript.net/
https://github.com/getify/You-Dont-Know-JS
https://es2017.io/?product_permalink=kOCPh&product_id=kOCPh&sale_id=noshare#declarations
Series bài giảng miễn phí trên Youtube https://www.youtube.com/watch?v=12QRecyUd28&list=PL7pEw9n3GkoW0ceMeoycg9D00YjPAbtvt&index=2