concepts in physics

If you were left with 7 different concepts, what would you pick? (Assuming you have to live the rest of your life with the 7 concepts that you picked)

This is "just for fun", not a question

Some concepts include:
1. Moment of inertia
2. Conservation of mechanical energy
3. Newton's 1st, 2nd, and 3rd laws
4. Newton's law of universal gravitation
5. Conservation of angular momentum
6. Torques and their conditions of equilibrium
7. Rotational kinetic energy
so on so forth

What would your list be??