• Ctrl+b " - split pane horizontally.
  • Ctrl+b % - split pane vertically.
  • Ctrl+b arrow key - switch pane.
  • Hold Ctrl+b, don't release it and hold one of the arrow keys - resize pane.
  • Ctrl+b c - (c)reate a new window.
  • Ctrl+b n - move to the (n)ext window.
  • Ctrl+b p - move to the (p)revious window.\

Tmux tutorial
Tmux the terminal multiplexer