start new with session name:
tmux new -s myname
attach:
tmux a # (or at, or attach)
attach to named:
tmux a -t myname
list sessions:
tmux ls
kill session:
tmux kill-session -t myname
ctrl + b
and
:new<CR> new session
s list sessions
$ name session
% horizontal split
" vertical split
o swap panes
q show pane numbers
x kill pane
⍽ space - toggle between layouts