How can I get to know potential letter writers (like professors) better?
Do your best to get to know professors and advisers while you’re in school. For professors (especially in classes you excel in), go to their office hours, and ask questions in classes. If possible, take more than one class from a professor you respect or connect with. You can also do a research or independent study project with faculty, or take on other extra projects in classes. For advisers, be sure to schedule regular advising appointments. Seek their advice, and have substantive conversations with them about your goals, your skills, and your potential career path.