1. www.codecademy.com 2. www.lynda.com 3. www.udemy.com 4. www.udacity.com 5. www.coursera.org 6. www.w3schools.com 7. www.thenewboston.org 8. www.programmr.com 9. www.codeavengers.com 10. www.codeschool.com 11. www.learnstreet.com 12. www.teamtreehouse.com 13. www.sqlzoo.net 14. www.codehs.com 15. www.teamtreehouse.com 16. www.html5rocks.com 17. www.codepen.io 18. www.sitepoint.com 19. www.tutorialspoint.com 20. www.javatpoint.com