= (equal sign)
Start a formula.
Move the insertion point into the formula bar when editing in a cell is turned off.
In the formula bar, delete one character to the left.
Complete a cell entry from the cell or formula bar.
Enter a formula as an array formula.
Cancel an entry in the cell or formula bar.
In a formula, display the Insert Function dialog box.
When the insertion point is to the right of a function name in a formula, display the Function Arguments dialog box.
When the insertion point is to the right of a function name in a formula, insert the argument names and parentheses.
Paste a defined name into a formula.
Alt+= (equal sign)
Insert an AutoSum formula ...