tmux is terminal multiplexer that allow you run multiple terminals inside terminal.
it follows stricture of session, window, pane
here is the minimal cheat sheet that help you use tmux:

• operation
• configuration

command tmux launch a new tmux terminal session with one terminal window
Ctrl + B then :new add a new tmux terminal session with one terminal window
Ctrl + B then D detach tmux terminal session and go back to home terminal
command tmux a attach terminal session back
Ctrl + B then S list all terminal Sessions and Windows; H J K L to navigate; Enter to enter in; X to kill; Esc go back

Ctrl + B then C add a new terminal window
Ctrl + B then N go next window
Ctrl + B then P go previous window
Ctrl + B then X to kill current window or pane

Ctrl + B then % add new terminal window pane horizontally
Ctrl + B then " add new terminal window pane vertically
Ctrl + B then ⬅️ ⬆️ ⬇️ ➡️ navigate activation to another pane
Ctrl + B then { move current pane to left
Ctrl + B then } move current pane to righr
Ctrl + B then Z zoom current pane to full screen or unzoom
Ctrl + B then :resize-pane -L 1 resize pane 1 unit more to Left
Ctrl + B then :resize-pane -D 1 resize pane 1 unit more to Down
Ctrl + B then :resize-pane -U 1 resize pane 1 unit more to Up
Ctrl + B then :resize-pane -R 1 resize pane 1 unit more to Right
Ctrl + B then :join-pane -s1 -t0 move window-1 as pane to window-0
Ctrl + B then :break-pane break current pane to a window

Ctrl + B then [ enter copy mode
⬅️ ⬆️ ⬇️ ➡️ to navigate
space bar to select
Enter to copy
Q quit copy mode

Ctrl + B then T show big clock; any key to exit clock

systemwide config file: /etc/tmux.conf
user specific config file: ~/.tmux.conf

command tmux source-file /etc/tmux.conf reload config file

set -g mouse on to use mouse in tmux

set -g pane-border-status top add status border to top of pane
set -g pane-border-status bottom add status border to bottom of pane
set -g pane-border-style fg=brightcyan set pane border color, bg=green,fg=cyan set both background and foreground color
set -g pane-active-border-style fg=white set active pane border color, bg=blue,fg=yellow set both background and foreground color
set -g pane-border-format "#[fg=red]<#P>#[fg=green]#{pane_current_path}>" set contents of pane status border, "" clear contents

set -g status-position top move status bar to top
set -g status-style bg=black set tatus bar color, bg=black,fg=brightblue set both background and foregound color
set -g status-justify centre move window list to centre
set -g window-status-current-format "#{?window_zoomed_flag,( #I ),(#I)}" set contents of current window in window list
set -g window-status-format " #I " set contnets of other windows in window list
set -g status-right "#[fg=cyan]%I:%M %p " set contents of status bar right side
set -g status-left "[#S]" set contents of status bar left side

set -g message-style bg=black,fg=white set message bar colors

set -g clock-mode-colour magenta change big clock color to magenta

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