What Does Selling Long Tail Really Mean?

Everyone mentions it but how does long tail really work- what are its advantages... and flaws?
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links. Clicking on the below links may result in a commission for us if an item is purchased.

Products that we use
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CZUR Scanner (revolutionized our listing process)
https://amzn.to/3gvSbRH

Newspaper Bags (order this size, you will be happy you did)
https://amzn.to/3v6EIUq

Cardboard pads for magazines (high quality + fast delivery)
https://ebay.us/YXcTBj

BCW Life Magazine Bags (Always nice to have these in stock)
https://amzn.to/3ncQtWE

BCW Magazine Bags (We go through hundreds of these a day!)
https://amzn.to/3xe5agN

BCW Comic Bags & Backers (What we use to ship comics)
https://amzn.to/3aAfplG


Our eBay listings
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Papergoy
https://ebay.us/nHjVYs

Mr-magazine
https://ebay.us/gIZeO3