It no news that men are used to having a side chick after marriage, even girls this days are more comfortable dating married men to single men. Why this trend like this, I may not know as most of the low and high class ladies are involved in this, so it not necessarily about money. A lady in marriage must understand she has the sole responsibility to build her home. If she fails to do this, her marriage may end up in disaster.

Respect Your Husband
This is important if you are to have a happy home, you need to understand what your husband love in order to do this. Being submissive do not mean respecting every words from your husband but showing him comfort when need be. For example, it would reward a wife that support her husband when he can no longer provide for his home maybe because he lost his job. Respect means giving due regard and loyalty to your husband in a supportive way.

Be content With Your Husband
Do not start by finding faults in your husband in any way, learn to accept things as you get to understand your spouse as you both live together. You need to to learn to build a healthy relationship and communication rather criticize every actions. It is better to put things in prayer rather than complain about it, and see things from the positive angle, always speak positivity into your marriage and about your husband. Avoid gossips from friends that see only faults in your husband, you can achieve this by turning a blind eye to most things happening.

Work on your Beauty
No man want to be with a woman that do not upgrade herself. Do not get too comfortable with marriage and stop taking good care of yourself, this would only ruin your marriage. Work regularly on your weight, shape through regular exercising, work on your smell by bathing regularly, putting on clean wears, and using the right deodorant and perfume. Try as much to look hot always. This would make you important in the eyes of your husband always.

Be Business Minded and Hardworking
No body need a liability, men are used to keeping things to themselves, so they are easily pressurized and filled with pressure, it is therefore necessary for you to reduce that pressure by assisting all the way, here I do not mean money, in the first few years of your marriage, you may find certain things about your spouse you may not love, as this shocking revelation are revealed, you must be creative to dealing with them so as not to mount pressure on your husband.

You must be willing to work on yourself and focus in life, build your personal capacity to handle responsibilities in life, build a career that you love and find rewarding, and let your life radiate beauty toward God and yourself, become whole with yourself. This completeness must not make you to ignore your husband but push you to be full of compassion and love toward him.

http://www.clarkegilbert.com/2015/08/things-lady-can-do-that-can-help-keep.html

INcomplete list.
what about being good in bed? In fact that should be the number one. Omitting it means you know nothing about this subject matter