iOS 12 introduced hundreds of useful shortcuts in its new app, where you can access them in your Shortcuts Library. They become even more efficient, however, when you can access them in more appropriate areas on your iPhone or iPad like on your Home Screen or in your Sharing options. For instance, it makes sense to be able to quickly access the "Where was this taken" shortcut while you are looking at photos in your Photos app. The way to do this is to add the shortcut to your Sharing options.
iOS 12 introduced Shortcuts, the successor to Workflow, which is an app that provides shortcuts that basically compress multiple-step tasks that involve using multiple apps into processes that require just a tap or two. For example, there is a shortcut called Home ETA that uses Maps to find your location and get the ETA for your trip home, then sends a custom message with your arrival time to whomever you set it up to send one to.