10 + 3 = 13
10 - 3 = 7
10 * 3 = 30
10 / 3 = 3.3333333333333
10 % 3 = 1
10 ** 3 = 1000 (exponent)
Pre-increment: 6
Post-increment: 5 now 6
Pre-decrement: 4
Post-decrement: 5 now 4

Operators do math: + add, - subtract, * multiply, / divide.
% gives remainder, ** is power.
++ and -- increase or decrease numbers by 1.