I’m assuming this is sway-specific, so just wanted to add that waybar itself also supports toggling hide/show bar by sending it a signal:

kill -SIGUSR1 $(pgrep waybar)

Depends pretty wildly on what you like.

Some things that I do:

I never want automatic locking — I always lock my machine manually when leaving it, with Super-\ (Super normally being the Windows key). I also want my monitor to power off after a few seconds in that mode, and then wake back up if I start typing. I also want to use a black screen rather than swaylock’s default white.

in my ~/.config/sway/config:

set $mod Mod4

# Handle session-locking triggered by stuff like loginctl lock-session
exec_always swayidle -w \
             lock 'myscreensaver.sh'

# Bind Super-backslash to trigger a session lock
bindsym $mod+backslash exec "loginctl lock-session""

in ~/bin/myscreensaver.sh:

#!/bin/bash
# Script that handles things necessary to "lock" the system when I'm away

# Pause any music that mpd is playing
mpc pause

swayidle \
    timeout 5 'swaymsg "output * dpms off"' \
    resume 'swaymsg "output * dpms on"' &
swaylock -c 000000
kill %1

By default, X11 (and Wayland, apparently, though I’ve spent less time looking at Wayland’s APIs) don’t “store” clipboard state – they just facilitate transferring copied data from one application to another application where it’s being pasted. This means that if one copies data in one application and then closes that application, the clipboard contents go away. I don’t really like this behavior. One way to avoid it is to use a “clipboard manager” — a piece of software that saves a copy of the data itself. If you install clipman and wl-clipboard, you can do this:

In ~/.config/sway/config:

# Make clipboard persist after application termination
exec_always flock -n $XDG_RUNTIME_DIR/$WAYLAND_DISPLAY-wl-paste wl-paste --watch clipman store

I want to get notifications when my laptop battery is low. Install poweralertd, and then in ~/.config/sway/config:

# Power notification support
exec_always flock -n $XDG_RUNTIME_DIR/$WAYLAND_DISPLAY-poweralertd poweralertd

I don’t use it that much, but Sway has a “scratchpad”, where one can stuff a window that one is working with. With this, I send the current window there with Super-Shift-minus then make it pop back up as a floating window with Super-minus:

# Scratchpad
bindsym $mod+shift+minus move window to scratchpad
bindsym $mod+minus scratchpad show

I have a mute button on my laptop’s keyboard. I make that mute the default PipeWire sound sink. In ~/.config/sway/config:

bindsym XF86AudioMute exec "wpctl set-mute @DEFAULT_AUDIO_SINK@ toggle"

I swap Caps Lock and left Control. This is how traditional Unix keyboards worked, and is generally more-friendly if you are using the Control key a lot more than Caps Lock. I’d consider this almost a precondition to use emacs without making your left pinky miserable. In ~/.config/sway/config:

input "type:keyboard" {
      xkb_options ctrl:swapcaps,compose:menu,compose:ralt
}

That also sets my menu key (on my desktop) and right Alt key (on my laptop, which doesn’t have a menu key) to be Compose. That way I can do things like type “ö” by hitting Compose o and then the double-quote key, or an em-dash (“—”) with Compose hyphen hyphen hyphen.

I don’t like keeping my mouse pointer visible unless I’m actually moving it. In my ~/.config/sway/config, this will hide it after three seconds:

# Hide mouse cursor after a period of inactivity.
seat seat0 hide_cursor 3000

I like to have a way to, using the keyboard, hide the latest notification shown by swaync, the default Sway notification manager. In ~/.config/sway/config:

bindsym $mod+grave exec "swaync-client --hide-latest"

Then Super-backtick will hide the most recent notification to show up.