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Lock Cells. You can lock cells in Excel if you want to protect cells from being edited. In this example, we will lock cell A2. Before you start: by default, all cells are locked. However, locking cells has no effect until you protect the worksheet. So when you protect a worksheet, all your cells (=worksheet) will be locked.
You can also lock your computer by using the Ctrl + Alt + Delete keyboard combination and then selecting Lock screen. You can also use the Windows + L keyboard combination to automatically lock the screen. In the menu that appears, click on the Lock option.