List of many websites where you can practice and exercise javascript (mainly to solve problems of real life ou practice willfully)
- https://www.freecodecamp.org/news/the-10-most-popular-coding-challenge-websites-of-2016-fb8a5672d22f/
- https://www.freecodecamp.org/learn/
- https://app.codility.com/programmers/lessons
- https://www.w3resource.com/javascript-exercises/
- https://www.codingame.com
- https://www.learn-js.org
- https://javascript.info
- https://www.hackerrank.com
- https://www.codecademy.com/catalog/language/javascript
- https://www.codewars.com/?language=javascript
- http://reactivex.io/learnrx/
- https://github.com/raloliver/matematica-para-programadores
- https://www.w3schools.com/js/js_exercises.asp
- https://edabit.com/challenges/javascript
- https://practity.com/582-2/
- https://www.frontendmentor.io/challenges
- https://github.com/florinpop17/app-ideas
- https://ydkjs-exercises.com