Sample i3 configuration - Source: https://blog.hildenco.com/2019/08/how-i-fell-in-love-with-i3.html

i3-config

#################################
# Source: https://blog.hildenco.com/2019/08/how-i-fell-in-love-with-i3.html
#################################

# start a terminal
bindsym $mod+Return exec gnome-terminal

# kill focused window
bindsym $mod+x kill

# change focus (vim-based hjkl)
bindsym $mod+h focus left
bindsym $mod+j focus down
bindsym $mod+k focus up
bindsym $mod+l focus right

# i3bar
bar {
	i3bar_command i3bar --transparency
	status_command i3status
	position top

	colors{
          #background #202020EE
          background #000000BB
          statusline #ffffff
 
#          class             boarder backgr  text
          focused_workspace  #545454 #3c3c3c #ffffff
          inactive_workspace #545454 #202020 #ffffff
          active_workspace   #545454 #202020 #ffffff
          urgent_workspace   #545454 #202020 #ffffff
    }
}

# nice transitions
exec_always --no-startup-id compton -f --config ~/.config/compton/config

# network icon/manager
exec --no-startup-id nm-applet

# kbd
bindsym $mod+space exec ~/.config/i3/kbd-switch.sh

# Custom Keybindings mapping keyboard Fkeys
bindsym $mod+f exec firefox
bindsym $mod+Shift+f exec firefox --private-window
bindsym $mod+g exec chromium-browser 
bindsym $mod+Shift+g exec  chromium-browser --incognito
bindsym $mod+F2 exec nautilus -w 
bindsym $mod+F3 exec gedit
bindsym $mod+F4 exec keepassxc
bindsym $mod+F5 exec gnome-boxes
bindsym $mod+Shift+F9 exec --no-startup-id i3-msg lock
bindsym $mod+F10 exec --no-startup-id i3lock -c 000000
bindsym $mod+Shift+F11 exec --no-startup-id shutdown now
bindsym Print exec gnome-screenshot -i
bindsym XF86Calculator exec gnome-calculator

# workspace back and forth
# switch between the current and the previously focused one
bindsym $mod+Tab workspace back_and_forth
bindsym $mod+Shift+Tab move container to workspace back_and_forth