If you’re going to post galleries on your site, we recommend the popular PhotoSwipe software. It works on desktop as well as mobile devices and makes use of touch, keyboard and mouse controls, which allow users to navigate galleries by swiping, with the left/right keys on a keyboard, the mouse, or by tapping/clicking the left/right navigation arrows.
PhotoSwipe comes in a plugin and integrates seamlessly with WordPress (all 9 columns are supported by Mockup), meaning you don’t have to learn a new interface just to insert galleries. But of course, if you already have a favorite gallery plugin that you prefer, you can use that instead. Here’s a quick example of a 4-column gallery: