
Using the addition operator (+):

Click on the cell where you want the sum to appear.

Type an equal sign (=) followed by the numbers you want to add, separated by plus signs (+).

For example, to add 5 and 3, you would type
=5+3
in the cell.

You can also reference other cells containing values you want to add. For instance, if numbers 5 and 3 are in cells A1 and A2 respectively, you would enter
=A1+A2
to add their values.

Using the SUM function:

This is a more efficient way to add a range of cells.

Click on the cell where you want the sum to appear.

Type
=SUM(
followed by the range of cells you want to add, enclosed in parentheses.

For example, to add cells A1 to A10, you would type
=SUM(A1:A10)
.
Excel also offers a helpful shortcut:

AutoSum: Click on the cell where you want the sum. Click the AutoSum button (Σ) located on the Home tab. Excel will automatically detect a range of adjacent cells to add and include them in the SUM function.
Let me know if you'd like to know more about any of these methods!