Parenting related, what are you strict about? Eating habits, bedtime, screen time? Something else?

I don't think I'm too strict about any of the above, but I am super picky about car seats. If someone else is taking them somewhere (which is rare), I always remind them about how their seats work and where the straps need to be, I don't care if it's overkill! Also bringing my kids around someone who is sick with a stomach bug or something as equally contagious is a no go for me.