There are many ways of taking care of your nose. First is stop putting dangling or nose piercings in your nose because it can cause infection. Habits such as nose picking or putting whatever things that should not be put in there re doesn't do any good since you don't know how would it affect your nose. Continuously sniffing whatever substance that intrigues is not a very good thing to do although it feeds your curiosity.
Cleaning it regularly with clean cloth or tissue paper.. Taking those boogers out!.. Regularly..
Don't smell harmful substance.s