To add two columns in Excel, you can use a formula to sum the values in each row of the two columns. Here's a stepbystep guide:

Select the Cell for the Result: Click on the cell where you want the sum of the two columns to appear.

Start the Formula: Begin typing the formula with an equal sign (=). For example, if you want to add values from column A and column B, you can use the formula =SUM(A:A, B:B)
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Select the Range: Select the range of cells you want to add. In this case, you would select column A and column B by dragging your mouse over the cells or by typing the cell references (e.g., A1:A10, B1:B10).

Complete the Formula: After selecting the ranges, hit Enter on your keyboard. The sum of the two columns will appear in the cell you selected.
By following these steps, you can easily add two columns in Excel and get the sum of their values.