I think the most intuitive way to select and copy is selecting with mouse and click the middle button to paste.
Tmux don’t support this with `set -g mouse on`, but you can add this to your tmux.conf:
``` unbind-key MouseDown2Pane bind-key -n MouseDown2Pane run "tmux set-buffer \"$(xclip -o -sel clipboard)\"; tmux paste-buffer" ```
However, this only works fine within tmux alone. When you select text in tmux, you can’t use middle button to paste them into other programs, the opposite is the same. I don’t know why.