The Seven Principles for Making Marriage Work – John Gottman

Fantastic read by a highly acclaimed and experienced author, founder of his own institute that both studies successful relationships and counsels those that need help.

This is THE book to give you practices for building happy relationships. The goal is to have at least five positive interactions for every negative one, and there is a lot of ground and approaches covered to help that be the case.

Here are a few infographics that cover some of the main thrusts of the book, but highly recommend reading through it, even if you are not in a serious relationship at the time – gives you a great head start on difficulties you may encounter and what can be done to mitigate them, as well as an understanding of what makes for positive relationships.

The Gottmans also maintain a strong web presence with The Gottman Institute – https://www.gottman.com/ – tons of articles that further unpack the lessons and learnings the Gottmans have uncovered with their work.

Good Points for maintaining the health of your relationship
Psychologist John Gottman's "Relationship Repair Checklist"