You can make it as complicated as you like. Set it on all metal with a single tone and dig everything and you'll sweep all the metal out of an area.
But if you don't want to spend a lot of time digging half-dissolved pre '82 cents that a Coin-Star will reject . . . check out the chart. The F75 will tell you lots. You can pay attention or not. It's simple to use but has incredible sophistication.
I like to watch the display and decide myself what to dig rather than try to mask out certain objects. That chart can save you a lot of crap digging in city parks. Up to you.