I just started with that SEP article and then googled around for some other books and videos. There are some excellent lectures on YouTube, this one for example

I just started with that SEP article and then googled around for some other books and videos. There are some excellent lectures on YouTube, this one for example: https://youtu.be/UhX1ouUjDHE https://youtu.be/UhX1ouUjDHE Also, you might find that symbolic logic is a good introduction to thinking mathematically. I used Klenk’s Understanding Symbolic Logic for a course a decade ago and really enjoyed it. For actual mathematics lessons, Khan Academy is pretty solid.