Amazon Seller Central Help

Hi, as of today my boss is advising me to learn the ins and outs of using Seller Central, I don’t know much about it but he said it might be good for me to learn it. The thing is I don’t really know where to start or how to learn it and master it.

So if you guys have any resources or tips that I should learn, it would be helpful. thanks!!!!!

PS: No rush in learning it, but I would like to become proficient at it.