You probably already know you can switch between all your available Workspaces by holding down the Alt key and tapping the „F“ keys (F1-F12). But there’s another cool shortcut you can use to toggle between the last two Workspaces used — hold down the Alt key and tap ~ (that’s Alt+tilde — tilde is the squiggle character next to your 1 key).
This functions sorta kinda like Windows Alt+Tab task switcher — if you keep different apps in different Workspaces, you get basically the same effect.
Mac users — use the Command key instead of Alt.