Use the prefix ^Ctrl-a. This is the most ergonomic combination, offering the least ulnar deviation. It does require, however, that the bash shortcut for moving the cursor to the start of the line (^Ctrl-a) be executed twice. This is not applicable if using the vi-mode plugin for Zsh, which allows Vim-like motions on the command-line.

tmux new -s <session>

tmux attach -t <session>

tmux ls

tmux kill-server

How to swap panes

The swap-pane command can do this for you. The { and } keys are bound to swap-pane -U and swap-pane -D in the default configuration.

How to copy text with a vertical split

Use <prefix>-z to expand (zoom) the current pane. Copy the needed text. Use <prefix>-z to return the pane to its original size.