For egg laying hens... While layer feed contains added calcium, an additional source of calcium, such as oyster shells or crushed eggshells, should be made available in a separate dish, apart from the feed.
Poop scoop. 2 inches of coarse sand in the coop. You’d be surprised at how this eliminates the smell! And I only scoop twice a week – still no smell. Twice a year – January and again in July – I take out all the sand and start over. During the July cleaning, I pick a hot day to scrub it down with soap and water… and the earlier the better, so it has time to dry before I replace the sand. No one will ever know I have chickens.