I keep running out storage. What apps can I delete?
If you look under Settings>Applications>Application Manager you can see your apps. You'll have to click on them to see what you can and can't uninstall as some are required for the phone to function.
Another option is to get an SD card. The Galaxy S5 supports expandable memory. Take the back off the phone, take the battery out and above where the SIM card is (top right corner of the battery tray) you'll see where you can add an SD card above the SIM card slot.