Research into self-determination theory has shown that doing things we find interesting has many positive effects. Doing interesting work in intrinsically rewarding. This means that the doing of the work is so interesting and pleasurable that we need no encouragement to want to do it. When we do such activities we tend to be more engaged, we learn and perform better and we persist longer. By the way, what makes activities interesting is not only determined by the content of the activity bit also by the context in which we are doing it, for example the pleasant social interactions we have when doing the activity.
Research has shown that many people tend to overestimate their own capabilities. This overconfidence may undermine performance and relationships with other people. This tendency of people to be overconfident is often thought to be universal. New research, however, shows that this is not the case. It shows that people with a fixed mindset are more vulnerable to overconfidence.