There are a few ways to highlight in Excel. The first way is to select the cells that you want to highlight and then go to the Home tab and select the desired color from the color palette. The second way is to select the cells that you want to highlight and then press Ctrl+1. This will open the Format Cells dialog box and you can then select the desired color from the color palette. The third way is to select the cells that you want to highlight and then press Ctrl+Shift+&. This will add a border around the selected cells.