I agree with the people recommending the built-in tutorial (C-h t) and the official manual. Emacs' documentation is very good. Also, the basics of Emacs haven'

I agree with the people recommending the built-in tutorial (C-h t) and the official manual. Emacs' documentation is very good. Also, the basics of Emacs haven't changed since forever so some of those dated resources you mention may be just fine. Good luck! I hope you like it.