Mobile: Dragging on the spacebar while typing allows you to move the cursor (This one has been invaluable to me since I found out a few weeks ago, it drove me nuts clicking and praying it would end up where I wanted it, man I hate mobiles still though). Desktop: In windows Explorer, if you need to quickly open a command window to the current folder shown, simply click the address bar and type cmd, press enter - WTH, why did I not know this one until a week or so ago.
Also on mobile at least in swiftkey and I believe gboard you can do the same thing on the delete button and highlight text and its deleted when released. I found that one pretty useful.
