Never stop learning. Ever. The world is moving forward, advancing, and so should you. Calculus can be a very powerful tool. Here are the 3 greatest resources for learning calculus on your own and where to find them for free.

1. Videos by Professor Leonard on YouTube – This man is hands down the greatest person to ever teach Calculus. He explains everything very thoroughly and is very easy to understand and keep up with. He has full playlists for Calculus 1, 2, and 3 along with some other mathematics courses. Start here for Calc 1: https://www.youtube.com/playlist?list=PLF797E961509B4EB5
2. James Stewart’s Calculus Early Transcendentals – Use this textbook for a mass of practice problems. Calculus like any mathematics course is all about practice. Make sure to grab the complete solutions manual for this as well so you can check all of your answers. Make sure the editions of the textbook and solutions manual that you get match up. If you want to keep things legal, you should purchase these items. That said, both can be downloaded for free over here: https://b-ok.cc/s/?q=stewart+early+transcendentals
3. Paul’s Online Math Notes – This website has notes and practice problems from a professor over at Lamar University. The notes are great to review and it never hurts to have more practice problems. Check it out at: http://tutorial.math.lamar.edu/

I have no affiliation with any of these sites/resources other than that I have used them myself and was very impressed by them.