You mean something like this?
# Vol up
bindsym XF86AudioRaiseVolume exec --no-startup-id pactl set-sink-volume 0 +5%
# Vol down
bindsym XF86AudioLowerVolume exec --no-startup-id pactl set-sink-volume 0 -5%
bindsym XF86AudioMute exec --no-startup-id pactl set-sink-mute 0 toggle
bindsym XF86AudioPlay exec playerctl play
#Pauze the play
bindsym XF86AudioPause exec playerctl pause
bindsym XF86AudioNext exec playerctl next
bindsym XF86AudioPrev exec playerctl previous
# Screen brightness
bindsym XF86MonBrightnessUp exec xbacklight -inc 20
bindsym XF86MonBrightnessDown exec xbacklight -dec 20
When you have an Fn key on your keyboard try to finout its keycode with
xev and look it up with
Or use $mod+Fx where x the number of the functionkey.
For instance screen brightness increase is under your F6 key which you normally activate with fn+F6… Forget the fn key and just set something like
bindsym $mod+F6 exec xbacklight -inc 20
Go on till you have all the key settings you need.