On that device storage page, look for apps you don't use. Tap them and select Delete App. Any purchased app is always available to re-download again at no extra charge from the App Store.
There are two built-in iOS settings that can help you clean up a significant amount of storage on your iPhone -- one permanent and the other temporary. More free space will let you install the latest ...
The only way to get rid of that is to actually delete the app. Offload as many apps as you need until you have enough storage. You can't use an app that's offloaded, but if you want to get an app ...