HackerRank
@hackerrank
Formerly Facebook Challenges, HackerRank is a learning and competition community just for programmers. Compete against fellow programmers to solve problems, and you might just catch the eye of one of the many hiring engineers who turn to HackerRank to source top programming talent.
MIT Open Courseware makes historical courses straight from MIT professors available to anyone with a thirst for knowledge, free of charge. Complete with video lectures, activities, and much more, you can’t beat access to free state-of-the-art learning on the fly.
MIT Open Courseware
@MITOCW
7
https://stackify.com/18-websites-every-developer-should-visit-right-now/