I teach university-level Physics, covering various topics such as Classical Mechanics, Quantum Mechanics, Electromagnetism, Einstein's Theory of Relativity (Special and General), Wave Physics, Spectroscopy, and Astrophysics, etc. I have created predefined packages that you can request online. You now have two packages available: the Twin Paradox Package and the Famous Formula E=mc² Package. With these, by learning basic university mathematics, you can learn about Einstein's Special Theory of Relativity, the phenomena of the Twin Paradox and aging (as you may know from the movie "Interstellar"), as well as Einstein's famous formula: E=mc². These packages are in English.