My father always taught me you earn money with your back (unskilled labor), your mind (skills) or your money (investments). Everyone can do unskilled labor so

My father always taught me you earn money with your back (unskilled labor), your mind (skills) or your money (investments). Everyone can do unskilled labor so supply and demand dictates it will pay less and obviously be more physically demanding. Almost everyone can improver their situation by gaining skills/education. It’s a truism because everyone won’t.