Yes I watch all his videos. My favourite is “Some very needed comparisons”. I started doing.(just for fun) a complete under-graduate and graduate course in Mathematics in my spare time after watching this video.
Are you doing an online course? Funny enough, I was thinking of the same thing (or at least some mathematics basics before an online CS curriculum). I'd love recommendations if you have any. Cheers.
No, just via books. I have a degree in mathematics which I completed 20 years ago so part of it is just recalling what I had learned. But otherwise I just bought books covering the entire curriculum - some based on Susan Rigetti’s blog post on mathematics (should be easy to search).