That, is, I have almost completed the 3 courses in the General Physics series. I am taking other courses in Dynamics and mathematics, but mostly for engineering. I would like to branch out a little now, or better still, hone in on some other areas of physics. After studying the fundamentals of physics, i.e. Newton's Laws through electricity and magnetism, what is the next logical step? I won't necessarily being taking classes in it in school, but I would like to continue to study physics. Should I start looking into the modern fields? What do you think the next few topics I should get into are? I have completed 2 of 3 Calculus courses, and I am in the middle of an intro differential equations course. What do you think is next?