See https://sean.fish/d/tmux.conf?dark for my config
prefix : to bring up tmux command prompt prefix ; to swap between panes prefix , to rename current window prefix $ to rename current session
For scrolling, enabling mouse mode means scrolling automatically throws you into copy mode, else prefix [, then vim keys. Can also just to prefix PageUp to enter and scroll up. See https://superuser.com/a/209608/887225.
https://hyperpolyglot.org/multiplexers (also includes comparison to screen) https://man7.org/linux/man-pages/man1/tmux.1.html