My tmux conf

.tmux.conf

# Change prefix from Ctrl+b to Ctrl+a (easier to reach)
unbind C-b
set-option -g prefix C-a
bind-key C-a send-prefix

# Split panes using | and -
bind | split-window -h
bind - split-window -v
unbind '"'
unbind %

# Switch panes using Alt+arrow without prefix
bind -n M-Left select-pane -L
bind -n M-Right select-pane -R
bind -n M-Up select-pane -U
bind -n M-Down select-pane -D

# Enable mouse mode
set -g mouse on

# Start window numbering at 1
set -g base-index 1
setw -g pane-base-index 1

# Reload config file
bind r source-file ~/.tmux.conf \; display "Config reloaded!"

# Increase scrollback buffer
set -g history-limit 10000

# Better colors
set -g default-terminal "screen-256color"

setw -g mode-keys vi
bind-key -T copy-mode-vi v send -X begin-selection
bind-key -T copy-mode-vi C-v send -X rectangle-toggle  # Block selection
bind-key -T copy-mode-vi y send-keys -X copy-pipe-and-cancel 'xclip -in -selection clipboard'
bind-key -T copy-mode-vi Enter send-keys -X copy-pipe-and-cancel 'xclip -in -selection clipboard'