Here is a list of websites I had saved from Reddit about 8 years ago. Apologies in advance, I haven’t checked any of the URLs if they are still valid.
hitching a ride to add on various study helps. free online education dump incoming:
http://education-portal.com/academy/course/index.html
http://101science.com/
https://iversity.org/
http://www.openculture.com/freeonlinecourses
https://www.coursera.org/
https://www.edx.org/course-list
http://www.dliflc.edu/products.html use the GLOSS link
http://www.coursehero.com/subjects/
http://oli.cmu.edu/
http://ocw.mit.edu/courses/find-by-topic/
http://www.saylor.org/
http://ocw.jhsph.edu/
http://www.open.edu/openlearn/
http://ocw.tufts.edu/
https://itunes.stanford.edu/content/rss.html
http://webcast.berkeley.edu/#
http://www.makeuseof.com/tag/3-websites-started-learning-programming-language/
https://www.futurelearn.com/
http://www.flashcardmachine.com/ You can use flashcards made by other users. Whether you trust them is up to you
http://freerice.com/category It quizzes you on the basics of a subject o your choosing, and donates rice for each answer you get right once you turn off adblock
http://openstaxcollege.org/
http://justenglish.me/2012/09/01/free-books-100-legal-sites-to-download-literature/
http://blog.boundless.com/2013/04/the-cost-of-textbooks-is-too-damn-high-so-boundless-made-free-ones/
http://freescience.info/index.php
To the best of my knowledge, these are all free and legal, and of varying degrees of usefulness. here's the thread I originally put it in, which may have some similar stuff. http://www.reddit.com/r/AskReddit/comments/268a0s/what_random_things_can_i_get_certified_for_over/
You are supposed to just sit at the cemetery not dig holes