Is there a particular area of philosophy that studies or classifies the different kinds of theoretical problems in which philosophy (or any other activity) focus on, mainly in terms of their internal structure, nature or any additional characteristic theoretical problems might present, including their solutions (when possible)? Is there an area of philosophy that studies, for example, the "form" of theoretical problems, so to speak, so philosophers can become familiar with different types of problems and thus suggest appropriate strategies when approaching other similar problems? Something that would get the philosopher a rough idea regarding the type of solution he or she should or should not expect from his/her investigations? Thanks for your time. (Juan J., philosophy enthusiast and future philosophy student!)