What are the behavioral habits that changed your life that you can implement instantly?

For me:

Not taking anything personally. What people tell me, think about me or talk about me is nothing to do with me. Everybody has a version of reality in their heads and they are giving a fight to keep that reality intact. Their reality was created based on everything they learned. They are judging me based on their learning not based on the truth. It is never about me. It is about them. Whenever I get angry at someone, it is also not about them but it is about me.
Seeing this truth saved me from most of my sufferings.