Excel formula to split up every character in a cell. This allows you to make really complex formulas that do things like verify patterns or check cell contents. You also learn how to check the cde for each character so you can more easily do things like check for hidden spaces or check for lists of allowed characters.
(Courtesy of a youtube comment from Wayne.)
=MID(A2,SEQUENCE(LEN(A2)),1)
=CODE(MID(A2,SEQUENCE(LEN(A2)),1))