Open Emacs and press <return> to read the tutorial. This gives you the basics to be productive.

Understandably, some people complain that it shouldn't need a tutorial or the defaults are bad. There's validity to that angle. There's also validity to Emacs pre-dating GUIs, the IBM keyboard, and the x86 instruction set. Once you get past the history of windows and killing, you can explore. The history is also super interesting!

https://www.emacswiki.org/emacs?EmacsHistory

https://dl.acm.org/doi/abs/10.1145/3386324

After you've read the tutorial, go wild. Try stuff out. Break things. Fix them. Learn your limits. Learn that there are very few limits imposed by Emacs itself.

Hands down, the best resource for Emacs is Emacs itself. Especially, the Emacs manual and the Elisp manual. The "An Introduction to Programming in Emacs Lisp" is also excellent if you're not familiar with Lisp. Learn to read Info files and learn the help system (basically C-h f and C-h v)

https://www.gnu.org/software/emacs/manual/

Emacs really is a flagship of Freedom, with all its pain and glory. It lets you exist at the threshold of your zone of proximal development. Every bit you put into Emacs, you get a return on investment.

Welcome to the Emacs community! It's full of weirdos and wizards, as well as regular folk. Stick around and I'm sure you'll make friends in no time.