tmux

I learned everything I know at tmuxcheatsheet.com but here's some stuff I always forget:

Copy and paste large blocks of text

1. Press CTRL + b and then [ to enter copy mode.
2. Use the arrow keys to go to the position from where you want to start copying.
3. Press CTRL + SPACE to start copying.
4. Use arrow keys to go to the end of text you want to copy.
5. Press ALT + w or CTRL + w to copy into Tmux buffer.
6. Press CTRL + b and then ] to paste in a possibly different Tmux pane/window.

Source: https://www.rushiagr.com/blog/2016/06/16/everything-you-need-to-know-about-tmux-copy-pasting-ubuntu/