Since the chickens aren't moving around at night, the poop will normally pile up under the roosts. There are a lot of different ways and variations you can use to get that poop out if the coop. You can put some type of droppings board under the roost, usually a foot wider than the roost works. Some might use a flat piece of plywood, some might put a piece of linoleum over that wood to make scraping easier. Some build a tray and fill it with sand, PDZ, wood shavings, or something else. Some even make that tray so it will slide out through the wall for easy cleaning. Some scoop the poop from that tray to save the bedding and some just change out all the bedding.
Some hang a tarp or canvas sling or hammock under the roosts. Others may use bins set on the floor or even shelves so all you have to do is empty out the bins. Some people put wire over those bins to keep the chickens out but others don't.
I built a brooder in the coop with the top of it a flat piece of plywood that acts as a droppings board. I scrape it as necessary. The brooder doesn't go all the way under the roosts so I put bins on the floor which gives me something to scrape the poop into.
I put a juvenile roost over my nests which makes a great place for the young chickens I'm integrating to sleep that's not my nests. You can see the brooder off to the right. As you can see I don't scrape them a lot.
Some people use sand or something else in the coop floor or in the run and scoop clumps of poop out of that to keep the poop from building up there, especially if they have tiny coops and runs common in suburbia. I'm not sure of you are talking about that. A trick to mix the poop with the bedding is to toss scratch or another treat on the bedding so the chickens mix it for you with their scratching. If you mix the poop up so the bedding keeps it dry you can go a lot longer between cleaning.
I put my pure poop in my compost. I've burned plants before when I put it straight in the garden so now I compost it. If you put it in the garden in the fall it will break down before planting season.
