I’m getting older and I’m forgetting things. I didn’t keep all my school resources from when I was a kid, but I’d like to re-discover math.
What are some good (free) resources for basic to advanced math?
Khan Academy
A few years ago I wanted to take some classes at a community college, and one of their requirements is to take an assessment test to see where you’re at with everything. I told myself there’s no way I wanted to take any remedial math classes, so I used Khan Academy to refresh my skills, and I actually learned some new techniques. It’s great!
I cannot stress enough how great this website is. I was using it to teach myself calculus, there are awesome videos that break everything down and taught me much better than the professor I had.
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mathacademy.com is often mentioned as good but it is not free
Streetfighting mathematics by Sanjoy Mahajan.
3blue1brown, veritasium, welsh Labs
There’s a whole bunch on YouTube.
bprp (= black pen, red pen. He has multiple channels of varying difficulty), Prime Newtons, Sybermath / a+bi, Andy Math and Michael Penn to name five. One or more of their respective styles or their level might not be right for you, but watch a few anyway and you might get recommendations for other channels that you like better.
If you like popular or recreational mathematics, Numberphile is a long-running channel with hundreds of videos, and relative newcomer Wrath of Math is doing numbers (in more than one sense) at the moment.