Here’s a tiny tip. By default
C-x k runs the command
kill-buffer which prompts you for which buffer you want to kill, defaulting to the current active buffer. I don’t know about you, but I rarely want to kill a different buffer than the one I am looking at, so I rebind
C-x k to
kill-this-buffer which just kills the current buffer without prompting (unless there are unsaved changes).
Just add this to your emacs config file
(global-set-key (kbd "C-x k") 'kill-this-buffer)