The best thing to learn in dating is respect for another person you choose to bring into your life.
Being married has a lot to do about sacrifice and giving of your selfish wants and desires to the better good of the marriage and family.
Of course, having good, decent fun is always the best thing to do in pre-marriage relationships.
Do those things that you will be proud of when you are a parent, grandparent.
Get to know his/her family and help them out in...