tmux, like other great software, is deceptive. On the one hand, it's fairly easy to get set up and start using right away. On the other hand, it's difficult to take advantage of tmux's adanced features without spending some quality alone time with the manual. But the problem with manuals is that they aren't geared toward beginners. They are geared toward helping seasoned developers and computer enthusiasts quickly obtain the
Tmate is used as the "free reverse ssh tunnel". It is not super secure because a key is not required to connect, but it sure is conventient. Tmux is used inside the Tmate session to share multiple terminal windows
You've createe a new tmux session where you will do your work named foo.