Lame answer but YouTube. Channels in the vein of freecodecamp.org and Stanford Online are incredible. Any skill, hobby, repair, or question I can think of probably has videos there.
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Probably Khan Academy
I use youtube because most educational content is available en masse there for free.
It would be great to see more on Odysee.
roadmap.sh
Wow this is great
YT and Wikipedia
Those are the two cornerstones of modern web. However, recently Bing got an LLM upgrade, so that tool is beginning to compete with those two. Learning stuff by asking questions seems to be working really well for me.
Oh yeah haven't tried bing chat yet but I I'm using chatGPT and it is quite useful it helped me alot
Mhm, I do this too! It really helps in finding answers to very specific questions
The trick is to probe the same question from several different angles. Occasionally youโll find that the first answer wasnโt correct, but youโll eventually get to the right answer if you keep on poking around.
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/
Answering for looking it up later!
some big tech companies have courses on their websites, cisco microsoft google etc, worth to check imo.
Coursera