How to delete a slide in your PowerPoint presentation or delete an entire section of slides at once

You can delete a slide in PowerPoint simply by right-clicking on it, or delete multiple slides by selecting them all ...

How to add a border to slides in PowerPoint, and give your slideshow a sleek design

You can add a border to a PowerPoint slide by adding a rectangle shape and removing the fill color, which will give the appearance of a border.
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How to Crop Pictures in Microsoft Word, Excel, and PowerPoint

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.