What is the best approach for selecting a major if you don't already have one in mind?

Ask other students what they are majoring in$,$ search the web, ask your advisor.

Take a variety of courses, determine which ones are easiest for you, research feasibility and logistics$.$

Take a variety of courses, identify your interests and capabilities, research feasibility and logistics$.$

Browse the course catalog, find courses that look easy, choose a major that includes those easy courses.