There are many wonderful books out there with steps and tips on how to improve, enhance and keep the freshness and beauty of your marriage alive. Gary Chapman writes The 5 Languages of Love, a book that seeks to unlock the secrets of what makes a marriage happy and what makes it work. His main point is that unhappiness comes from the speaking of a variety of love languages that get crossed in the works. For example, words of affirmation, quality time, receiving gifts, acts of service, and physical touch are all different languages identified in the book and explained, so that people can understand what their spouses are saying even when they aren't exactly saying it. This will help you decode the various kinds of communication, gestures, and languages present in a marriage and when you become savvy about all of them, it will overall improve your relationship.
The 7 Principles for Making a Marriage Work is a book by John Gottman who discusses the various things that form an emotionally intelligent couple. By using some signs of a troubled marriage as well as many studies conducted in his love labs, he disproves many divorce myths and demonstrates problems with clear examples that can help you relate to the situation. Including many checklists and quizzes, this is an interactive way to learn about marriage and the various ways of communication.
Emerson Eggerichs writes Love and Respect: The Love She Most Desires, the Respect He Desperately Needs. Using biblical research as well as some psychological founding, this author works an argument that emphasizes the importance of unconditional love and respect for one another so that people can really enjoy the benefits of marriage as expected by the heavens. Basically he urges that the communication code between married peoples be cracked so that there as understood grounding between the two and a shared communicative bond. This is a great book for getting closer to your spouse and learning the basics of communication.