Resources that I think are quintessential for anyone who wants to learn!

Rice University teamed up with OpenStax to curate a free range of pdf's for all sorts of textbooks for a wide range of subjects. 

So start going ham with that if you want to refresh your memory on certain subjects!

Check it out! --> OPENSTAX

Free accredited knowledge from Scotland! Peep it! Explore what lies out there in the world. Boost the brain! --> The Open University | OpenLearn | Subjects

For those wanting to get into code and eventually become certified in a certain kind of coding field (albeit, these certifications have a fee, usually costing 100 bucks at best) --> w3schools | the world's largest web developer site

Anyone wanting to specialize in the entrainment arts? Journalism maybe? Here's another shot! --> Yellowbrick (be mindful, some of the things there can also cost you money if you're not careful. Make sure it says "get the catalog")

Until I post once more! Take care!