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 )