Newbie here need guidance for managing an Amazon seller account

Hi. I am a newbie and I want some guidance or study material maybe a YouTube video/channel where I can learn about the basics of how to manage a seller account and how to post products and deal with orders and manufacturer/packaging department. I did search before posting this but couldn’t find the exact content I might need or maybe I don’t know the jargon in this department. Any kind of help will be highly appreciated. Thank you.