Dock Spacers
Just a small thing that I found out about today and wanted to write down somewhere. Using Terminal, you can create blank spacers for the macOS dock. Simply run defaults write com.apple.dock persistent-apps -array-add '{"tile-type"="spacer-tile";}'
for as many spaces as you want, and then restart the Dock with killall Dock
. You can rearrange the spaces wherever you want, and can remove them just like any normal dock item.