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 Got any resources you recommend for an adult who wants to take your advice and start working on math problems regularly as a hobby?

I was pretty cool before but this should really put me over the top. 
 You should maybe start with a resource that covers all the basic fundamental topics like linear algebra, calculus, differential equations, and probability in a very digestible way. 

Assuming you already have some previous mathematical knowledge, this playlist might be a perfect fit for you.

https://youtube.com/playlist?list=PLZHQObOWTQDPD3MizzM2xVFitgF8hE_ab
 
 Once you complete the first one, you should start this one. By the way, don’t rush.

Side note: Pay close attention to linear transformations in the first playlist. Once you understand that, everything else becomes much simpler.
https://youtube.com/playlist?list=PLZHQObOWTQDMsr9K-rj53DwVRMYO3t5Yr