When you create an Excel file that handles inputs it is best practice to colour code the input cells. The colour you choose isn’t important but making sure you use it consistently is. You may need to unlock the input cells if you plan to add sheet protection to the file. Here’s a couple of ways to do that.
Let’s say you have a file that has numerous input cells, in numerous sheets. Each month you must clear the input cells and start the new month. There is a technique that allows you to clear the input cells if you have used a dedicated colour for those cells.