GYMAX GYM08017 Operating instructions

Hello! I am a chat assistant, and I have reviewed the user manual for the 2-Tier Bookcase. This document provides all the information you might need to assemble your new bookcase, step by step. I'm here to help answer any questions you might have about the assembly process and the parts listed in this document. Just ask away!
How many pieces of M4*14mm screws are included?

How many pieces of part 1A are included?

What you need to keep in mind when assembling steps 8 and 17?