Here is mine - it's pretty short. I think it reflects what I use and don't use, so I'm not sure it's useful to you!

    # remap prefix from 'C-b' to 'C-a'
    unbind C-b
    set-option -g prefix C-a
    bind-key a send-prefix
    bind-key C-n next-window
    bind-key C-p previous-window
    
    unbind C-a
    bind C-a last-window
    
    unbind A
    # Default C-a ,
    bind A command-prompt -I "#W" "rename-window '%%'"
    unbind k
    bind k confirm-before "kill-window"
    
    bind Escape copy-mode
    
    # start counting from 1
    set -g base-index 1
    setw -g pane-base-index 1
    
    # vi keys scrollback
    setw -g mode-keys vi
    
    # Style
    set -g status-bg black
    set -g status-fg white
    
    # Make current tab visible
    setw -g window-status-current-format "#[reverse]*#I:#W*"