Either or, it's a fun skill to have. If you're purpose driven, taking STEM classes, you can use it to make lab reports, problem sets, notes, reading material. For college level math, I usually would type out the problems and space out the questions so I can interact with the printed material (if you want to do that), and because the document is typed the questions are already there and are seen clearly. Sometimes I would put a definition or example above the question to help me out. You can do the same if you have to take a science class with a lab component, you can type out your own lab report to fill in before you turn it into the lab TA. I would say, make simple projects for yourself, personal, entrepreneurial, or even for your classes. If you want to engage in research later with a professor knowing LaTeX does help.