Click the cell where you want the result to appear
Type `=`
Enter the formula, such as `=A1+B1`
Press `Enter`
Use cell references, functions, and operators as needed
Start formulas with `=` every time
Example: `=SUM(A1:A10)`
Example: `=AVERAGE(B1:B5)`
Example: `=IF(C1>10,”Yes”,”No”)`