I agree with Sandi, wash as needed. I wash every 5-12 days, some people wash monthly, others cowash (conditioner wash) every other day, it's up to you.

Hair growth is genetic. If your hair has always grown fast then it'll continue to do so, the same goes for slow. There are people who say they've seen faster hair growth doing this or that but I think it's baloney Lol. Take a daily multivitamin to keep healthy and drink a lot of water. Your hair will do its job regardless though.

Sealing refers to trapping in moisture. Moisture is liquid, or water. Apply moisture to your hair with products based on water (first ingredient should be water/aqua/eau) and seal with a product that does not contain water. So water shouldn't be anywhere in the list. This is moisturizing and sealing.