This is a linkpost for https://waitbutwhy.com/2019/09/thinking-ladder.html
Our beliefs make up our perception of reality, they drive our behavior, and they shape our life stories. History happened the way it did because of what people believed in the past, and what we believe today will write the story of our future.
So it seems like an important question to ask: Why do we actually come to believe the things we end up believing?
It's a great introduction to many core rationality and LessWrong concepts which is fun and accessible to a general audience.
I recommend the whole series and really all of Wait But Why.