I sometimes lose my mouse cursor when I have several screens and many windows.
There is the option of wiggling the mouse to find it but I’d prefer to have a shortcut that moves the cursor into the active window. BetterTouchTool does that well. See this post:
I use Alt X to move the mouse into the top left of my active window.
However, beware, I tried using Double Space and managed to break things – was unable to enter any spaces on my Mac keyboard. The solution was to delete the key sequence