Your wife should also be your best friend.
Don't go to bed angry.
Don't ever let your parting words be cruel. There will come a day when those are your final words to each other.
Understand that time apart is as important as time together.
Don't measure your marriage by what works for others. Every marriage is unique.
Never lose sight of why you fell in love in the first place.
It does get easier as you go.
Best wishes ;)