There are a few different ways that you can quickly select cells in Excel. One way is to use the mouse to click and drag over the cells that you want to select. Another way is to use the keyboard shortcut of Shift+Arrow keys to select a range of cells. You can also use the Ctrl+Shift+Arrow keys to select a range of cells that are not next to each other. If you want to select an entire column or row, you can click on the header cell for that column or row. For example, if you want to select Column B, you would click on the header cell for Column B. To select multiple columns or rows that are next to each other, you can click on the first header cell and then drag over the other header cells that you want to select. You can also use the Ctrl key to quickly select non-adjacent cells or ranges of cells. For example, if you wanted to select cells A1, A3, and A5, you would hold down the Ctrl key and click on each of those cells individually. Or, if you wanted to select all of the cells from A1 to C5, you would hold down the Ctrl key and click on A1, then drag over to C5.