6 - The Integration Constant and Power Rule
If you have a constant a, in the derivative you would nuke that. Aka, make it zero.
In integrals, you do the opposite. You add the variable next to it.
Literally the "opposite" of the differentiation power rule, you add 1 to that exponent and divide the total result by this sum.
You can now move on.
7 - Linearity of Integrals and Integral Algebra