Learn to Code:

https://teamtreehouse.com

https://www.codecademy.com

https://www.codeschool.com/

https://www.edx.org/course/introduction-computer-science-harvardx-cs50x

https://www.safaribooksonline.com/

https://github.com/P1xt/p1xt-guides/blob/master/cs-wd.md

Ruby:

http://railsgirls.com/

http://rubykoans.com/

Haskell:

http://learnyouahaskell.com/

Git:

https://learngitbranching.js.org/

https://try.github.io

Swift:

https://www.raywenderlich.com

https://www.hackingwithswift.com/

Practice:

https://www.codewars.com

Machine Learning:

https://www.coursera.org/learn/machine-learning

https://www.kaggle.com/

Category Theory:

https://bartoszmilewski.com/2014/10/28/category-theory-for-programmers-the-preface/

Blogs:

https://medium.com/

https://dev.to/