There are so many pieces when it comes to polynomials that it is often hard to fit them all together and get the big picture of what they are and how they behave.
To help you gain some leverage on this I have two different sets of resources:
1) A set of reference sheets that serve as verbal and graphical summaries of the key concepts around polynomials
2) A great set of videos from LearnZillion that carefully walk through some of the big ideas around polynomials.
Here are the upcoming and current homework: