my [basic] tmux config, with comment containing default keybindings.

$sudo apt install tmux || slapt-get --install tmux

You need to install tpm (tmux plugin manager) https://github.com/tmux-plugins/tpm and catppuccin (fancy stuff, see config) https://github.com/catppuccin/tmux

catppuccin needs a patched font installed on the system to display icons correctly; these are not displayed correctly in the code below because the font is missing here, but get them from https://www.nerdfonts.com/font-downloads

The rest of the instructions are in the file below saved as .tmux.conf in the Linux user $HOME directory.

If you don’t want to bind leader+r to reload the config, use
tmux source ~/.tmux.conf
while tmux is running in terminal

# ######################################################
# On a new install: 
# 1. In a terminal: $ tmux killall; tmux source # #.tmux.conf; vim .tmux.conf
# In a tmux session: ctrl+b then r, then ctrl+b #shift+i
# ######################################################
# leader is ctr + b. 
# On a new install: 
# re-load this config on leader -r 
# Do " ctrl+b > r " every time you make changes.
unbind r
bind r source-file ~/.tmux.conf

# You _could_ set this to ctrl + s, where -g = global
# set -g prefix C-s

# allow mouse to resize panes
set -g mouse on
# Allow moving to a pane with the mouse. 
set-option -g focus-events on 
# yank plugin copies to clickboard on selection
set -g @yank_selection_mouse 'clipboard'

# ## Bind keys to actions ##
# Navigation - (leader= ctrl+b) > Left, Up, Down, Right.
bind-key h select-pane -L 
bind-key j select-pane -U
bind-key k select-pane -D 
bind-key l select-pane -R

# unbind %
# bind | split-window -h # h for horizontal
# unbind '"' # that's a " in singles quotes btw  
# bind | split-window -v # v for vertizontalliopi

# set pane index to start:1 not 0, re-number panes on close
set -g base-index 1
set -g renumber-windows on
setw -g pane-base-index 1

# allow more colours
set -g default-terminal 'screen-256color' #screen
set-option -as terminal-features ',xterm-256color:RGB'


# Layout catppuccin
set-option -g status-position top
set -g @catppuccin_window_left_separator "█"
set -g @catppuccin_window_right_separator "█ "
set -g @catppuccin_window_number_position "right"
set -g @catppuccin_window_middle_separator "  █"
set -g @catppuccin_window_default_fill "number"
set -g @catppuccin_window_current_fill "number"
set -g @catppuccin_window_current_text "#{pane_current_path}"
set -g @catppuccin_status_modules_right "application session date_time"
set -g @catppuccin_status_left_separator  ""
set -g @catppuccin_status_right_separator " "
set -g @catppuccin_status_fill "all"
set -g @catppuccin_status_connect_separator "yes"

# List of plugins, ctrl+b > I to install
set -g @plugin 'tmux-plugins/tpm'
set -g @plugin 'tmux-plugins/tmux-yank'
set -g @plugin 'catppuccin/tmux'

# Other examples:
# set -g @plugin 'github_username/plugin_name'
# set -g @plugin 'github_username/plugin_name#branch'
# set -g @plugin 'git@github.com:user/plugin'
# set -g @plugin 'git@bitbucket.com:user/plugin'

# Initialize TMUX plugin manager (keep this line at the very bottom of tmux.conf)
run '~/.tmux/plugins/tpm/tpm'

# Do not uncomment anything in this section 
# the run command above has to be last executable line
# Keybinding Reference

# C-b C-b     Send the prefix key
# C-b C-o     Rotate through the panes                    
# C-b C-z     Suspend the current client
# C-b Space   Select next layout
# C-b !       Break pane to a new window
# C-b "       Split window vertically
# C-b #       List all paste buffers
# C-b $       Rename current session
# C-b %       Split window horizontally
# C-b &       Kill current window
# C-b '       Prompt for window index to select
# C-b (       Switch to previous client
# C-b )       Switch to next client
# C-b ,       Rename current window
# C-b -       Delete the most recent paste buffer
# C-b .       Move the current window
# C-b /       Describe key binding
# C-b 0       Select window 0 (window=pane?)
# C-b 1       Select window 1
# C-b 2       Select window 2
# C-b 3       Select window 3
# C-b 4       Select window 4
# C-b 5       Select window 5
# C-b 6       Select window 6
# C-b 7       Select window 7
# C-b 8       Select window 8
# C-b 9       Select window 9
# C-b :       Prompt for a command
# C-b ;       Move to the previously active pane
# C-b =       Choose a paste buffer from a list
# C-b ?       List key bindings
# C-b C       Customize options
# C-b D       Choose a client from a list