Places to learn

Udemy
Amazon Kindle Books
Safari Books Online
Coursera
Udacity
MIT OpenCourseWare
arXiv
edX
CrashCourse
In a Nut Shell
Stack Exchange
TIL
Video Lectures
Google Scholar
TED
Treehouse
Pluralsight
Khan Academy
Project Gutenberg
Academic Earth
Open Education Database
YouTube
The Free Library
Future Learn
Stanford Online
Harvard Online
SlideShare
Scribd
The School of Life
PLOS Journals
Talks at Google