MacOs has a whole bunch of hidden settings that can only be accessed from the terminal. Here's one that helps keep things tidy.

You can add spaces to the dock to separate app icons. I've done this to create categories: work, writing, communication, browser.

To create a space in your dock:

1. open terminal.
2. add the following command: defaults write com.apple.dock persistent-apps -array-add '{"tile-type"="spacer-tile";}'; killall Dock
3. Press enter.

To remove the space:

1. command-click the space.
2. Select remove from dock

Easy, and it looks so much cleaner.