A quick simple tip, mostly for Mac users, with Excel and Google Sheets:
The shortcut for putting the $ symbol in your equations! (check out the tutorial video here)
Or for a more technical description; cycling through all 4 types of cell references (absolute, mixed reference (2x) and relative).
I’ve seen too many Mac (and a few Windows) users suffer by not knowing this shortcut, so here it is.
If you didn’t know about this shortcut, let me know over on the Facebook page, and if enough of you do then we can work out how much collective time we’ve saved using the tool below: