Whenever you see an object that is flashing lightly, that is something you can tag for the Rebels to pick up. These are resources that you can use to purchase new upgrades on your character. Whenever you see something you can tag, make sure you take the time to do so, every bit of resources you find can help you gain new abilities and better skills. There are four different kinds of resources you can gather while roaming around; Gasoline, Medicine, Comms Tools, and Food. Some side missions you complete can give you a big bonus of one resource, which may be vital to obtaining a helpful skill for your character. You can sometimes gain extra resources by completing smaller side missions that appear on your Tacmap. These will range from executing raids on enemy Armored trucks, attacking a stronghold, or even protecting a radio broadcast from being stopped.