To have a successful marriage, the main key is to obey God, he says to submit to each other under your fear.

Submit to each other in fear of God.
Ephesians 5:21 New King James Version (RVR1960)

They can also take other tips to help them avoid future problems, such as:

• Avoid getting irritated at the same time.
• Don't yell at each other.
• If someone has to win, let it be your spouse.
• Eliminate past mistakes.
• Don't go to bed angry.
• Congratulate yourself at least once a day.
• Ask for forgiveness if any fails.
• Self-assessment (I'm doing it right or wrong).
• Strive to make the other happy.

Marriage becomes a micro-company that starts with the entrepreneurial society and, depending on how they are advised and take the best recommendations, they will become a macro-company.

Thus, marriage begins with the union of a couple and then they become a large and empowered family.