Back years ago when I had much much more freetime I binged the below to learn how to read x86 assembly and use things like gdb. It's a lot of information to take in but I was getting into reverse engineering back then and have a bit of an obsessive personality so I thought it was great. Still do, so I refer people to the resources anytime something like this pops up.

https://opensecuritytraining.info/IntroX86.html