Making gridlines visible on your slides in PowerPoint 2016 is only a good idea if you use the Grid feature to attain some results. If you are serious about using Grids to position slide objects with more precision, you must first visit the options available for changing Grid settings. Once you have played around with the grid settings, you are better equipped and prepared to explore how the Snap to Grid feature can help you accurately position and move slide objects such as pictures, shapes, or anything else you can select and move on a slide!
Learn how the Snap to Grid option works in PowerPoint 2016 for Windows.