Khan Academy
this post was submitted on 07 Mar 2025
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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.
OMG lol, this is literally in my head because so many reddit users (before the enshittification) were saying it
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.
3blue1brown, veritasium, welsh Labs
Streetfighting mathematics by Sanjoy Mahajan.
mathacademy.com is often mentioned as good but it is not free