My partner and I have independently arrived at this conclusion. It's serving us wonders.
Some off the top of my head:
- People can and do change and it's totally valid to try to as well as help buff out rough edges.
- Establish a logical framework to communicate. Learn some formal critical reasoning if needed. Learn fallacies, etc.
- Discuss anything and everything, don't let things fester. There often are easy solutions before things have snowballed.
- Encourage introspection.
- Don't consider feelings as something immutable and sacred. Both positive and negative. One can foster or reduce either.