The study of the philosophy of science explores whether scientific results are actually the study of truth. Scientific realism is an area of study in the philosophy of science and has a contrasting view called anti realism. The debate between the two revolves around their disagreement between the existences of an external world. A scientific realist believes that an external world exists independent of our minds whereas the anti-realist, or the idealists, believes that no such world exists outside of us. Philosophy of Science changes the way you think about the world - and about the science, medicine and technology that pervade almost every part of modern life.
First of all, do not think of a job when choosing a course of study. Think of what you're interested in. The reason for that is simple: It is very likely; you will do better in subjects you find interesting than in subjects you find boring. And if you're good at something - at least at the level of tertiary education - you will very probably be able to turn that into a career position that you like to do and that is able to sustain your lifestyle
Although many people are unconvinced that that philosophy is important, I think there are good reasons to think it is important. Philosophy can not only help improve critical thinking skills, but it can help provide us with knowledge of logic that can greatly help improve critical thinking. Moreover, I do not find the view that philosophy makes no progress and provides us with no knowledge to be plausible based on the fact that it seems clear that everyone knows something about at least one philosophical domain (logic), and some people know more about that domain than others.