Hi guys! Sorry I'm new so the questions might seen a bit vague but I'm unclear about a lots of things I want to make a career purely in physics, I'd prefer cosmology and theoretical physics because that was I was so interested in from beginning. But I've heard the career in theoretical physics is tough/more like unstable and I should go for experimental. If I go for experimental physics what huge difference will it be from theoretical one or it is data analysis majorly. And if I dare to chose theoretical physics over it what kind of projects can one do in undergraduate level in Quantum Mechanics.