Any action you wish to apply on a cell requires the cell to be selected first. Normally, you just click a cell or drag your mouse across multiple cells. However, if you did not capture the entire area ...

To insert an in-cell picture saved on your device, from Microsoft's gallery, or imported through the web images search, first ...

To manually crop a picture in Microsoft Word, Excel, or PowerPoint, select it, and in the Picture Format tab on the ribbon, click the top half of the split "Crop" button.