This is the additional information page and you can skip it until you will be readdressed here from other sections of the documentation when needed.
Before you proceed with adding a collection to the NFT Stats or tracking its listings and sales with the NFT Tracker or setting up a Specific Traits-Based Roles rule with the Verify Roles plugin, you first need to prepare the Collection Slug (for the collections listed on OpenSea) or the Collection Symbol (for the collections listed on Magic Eden). Technically, this is absolutely the same thing, just named differently on these two marketplaces. So let's call it Collection Slug for shot.
Well, the Collection Slug is a part of the marketplace collection URL in the browser address bar, normally located after the last slash, but not always.
Collection Slug on OpenSea.
Collection Symbol on Magic Eden.
Contract Address on LooksRare.
The collections listed on LooksRare do not have a Collection Slug, and you don't need it. However, you will need the collection Contract Address, which can be found in the same way, at the end of the collection URL.
What's next?
Now, when you have your Collection Slug, you can proceed with adding a collection to the NFT Stats or tracking a collection's listings and sales with the NFT Tracker or setting up a Specific Traits-Based Roles rule with the Verify Roles plugin.