I like this, I would like to add: If you don't use tmux often, then enabling only the mouse support makes it much easier:

   $ cat .tmux.conf
   setw -g mouse on

Now holding the right mouse button brings up the context menu: horizontal split, vertical split, etc. And you can swap, of course, between panes with the mouse.

This is much easier to remember than the various keyboard shortcuts.

Copy & pasting, however, can be a bit frustrating. I also use this in my .tmux.conf:

    # Ctrl+b then v to paste from tmux's clipboard
    bind-key -T prefix v paste-buffer -p

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