Okay here goes.... One day you have a baby, and you have no idea what to do.. and you just start to roll with it. You make decisions about things that you've never thought about before, and you do that on as much sleep as you can get.
Repeat until the kids move out.
So in all seriousness that's the gist of it, but I would add one note that I found to be the most beneficial thing our household.... parents, know your children. Learn their quirks and their temperament and their logic and their inquisitiveness. Learn what comforts them and what angers them ... Learn their likes and dislikes, their opinions, their friends, their shows, and their favorite food. Don't waste the very brief opportunity that you have with them young... Because when they're old, if you haven't taken the time, you won't be able to find it.
In the end you do just roll with it. Roll well!