Any app you installed, you can uninstall without a problem. (And you can reinstall it later if you like.)
An app that you didn't install, or that you don't recognize - as Matty said, list the ones you're thinking of uninstalling. Also list your phone make and model (we need both because some manufacturers seem to be using the same names - is a G5 a Motorola or an LG?) Most apps that you shouldn't uninstall, you can't uninstall. But there are some you can, so list here first, then wait for an answer - before you uninstall something and kill your phone.
(By the way, deleting is just the shortcut on the home screen - the app is still in the app drawer. That's not a problem, but it doesn't free up much space either. Uninstalling is completely removing the app from the phone.)