I need help with a Accounting Discussion question

This discussion question has to be ORIGINAL and at least 300 words. I need this by Thursday 2/27/20 @ 5pm

In this Module, we learn about Stockholders' Equity (Chapter 13).  This week's discussion questions are as follows:

1).  Discuss the difference between authorized shares and outstanding shares.

2).  Are there other classifications of shares that are important to consider?

3).  What are treasury stocks and why do companies engage in their purchase?