The fundamental premise of REBT is that it's not the events in our lives themselves, but our beliefs about the events that upset our emotional state. Hence to change our negative emotions, we must attack through reason the beliefs that promote negative emotional states. Here's is a useful summary of the REBT approach: https://rebtnetwork.org/whatis.html .
What I love most about REBT is that it trains us to be our own therapist. That is quite empowering and liberating!