Here’s a quickie tip… Want to quickly open a Finder window showing your home folder? Just click anywhere on the desktop (i.e. behind any open windows) then press Cmd+Up.
This works because Cmd+Up in a Finder window browses to the parent folder of the one you’re currently looking at. So when you do it on the desktop, you’re taken to your home folder, because it’s the parent folder of the Desktop folder.
For what it’s worth, Cmd+Down opens any file — the same as Cmd+O. Select a file on the desktop, for example, and Cmd+Down will open it. This can be useful if you navigate around files using the cursor keys.