Some commands I learned along the way (on top of those already said)

C-x g - magit-status

C-c c - org-capture

C-x h - mark-whole-buffer

M-: - eval-expression

C-x C-u - upcase-region

C-x C-o - ace-window

(use-package ace-window :bind ("C-x C-o" . ace-window))

Allows you to number your buffers and choose the one you want by pressing the number associated with it

In dired, C-0 w gives you the full path to the file under the cursor