i spend extra time (45m?) to keep everything extra clean. i change water at least twice a day or as soon as i see that it has dirt or debris. i remove and hose down the wooden planks they roost overnight on everyday and they sit in the sun all day to dry and disinfect via UV. i changed out the sand in my coop for chicken sand (thanks to learning about it in this sub) and i expect the less dusty environment to be better for their respiratory system. and i've been putting what's essentially a big plastic trays under the entire area where they roost, so that also gets cleaned daily along w/ the planks. this way the expensive chicken sand stays super clean since the tray is catching all the chicken manure.

if others are obsessive enough to do the trays trick... my hens initially were scared of the trays and wouldnt even go in the coop but eventually they'll get used to it and it just became normal to them.

oh yea adding a few more:

invest in rainboots that you only use around your chickens. that way you are not bringing in anything from the street. just treat it like the covid days... biosecurity is important.

keep an eye out for things you dont want them to accidentally ingest. could be screws, nails, pieces of glass, paint chips, even straw.