None of those (e.g. lighting, physics, graphics) are truly difficult today with the advent of modern game tools (e.g Unity). Assuming you know basic vector math

None of those (e.g. lighting, physics, graphics) are truly difficult today with the advent of modern game tools (e.g Unity). Assuming you know basic vector math and can think in 3 dimensions, most problems related to sound, physics, graphics etc can be solved by some Googling.