Welcome to the wonderful world of chicken keeping! The hype is real and chickens (as you already know) are amazing!
ENJOY your chicks, love them every day and let them know that.
One thing I practice whether it be with a brooder of chicks or a coop of chickens is cleanliness, cleanliness, cleanliness.
I find that with that mantra you can hopefully avoid most of the preventable stuff. The non preventable stuff (we won't get into that) is out of your hands anyway so try not to worry.
The other thing I practice is prevention, prevention, prevention. Sit with your flock often. Monitor them, how do they look? Anyone or anything look off? Regular flock checks can help escalate any small problems before them become very large problems.
Have fun and welcome!