Tmux cheatsheet in 21 lines
Sessions # seperate instances of Tmux
Ctrl-b s # Lists sessions in tmux
Ctrl-b $ # Rename current session
tmux ls # Lists sessions on cmdline
tmux attach -t5 # Attach to session 5
Windows # hidden windows, like tabs
Ctrl-b c # Create new Window
Ctrl-b , # Rename current window
Ctrl-b w # List windows
Ctrl-b l # Open last window
Ctrl-b f # find by name and cmd history
Panes # split-screen windows
Ctrl-b " # Create new Horizontal Pane
Ctrl-b o # Switch active Pane
Ctrl-b [space] # Rearrage panes
Ctrl-b { # Reorders panes
Ctrl-b z # Zoom (full screen) active pane
Ctrl-B pageup # Scroll back, ctrl-c to end
This page has a chart for screen users making the switch to Tmux