A collection is a group of NFTs existing in the same contract! On LUXY each Collection is a Smart Contract in one of the networks supported by LUXY. The contract defines the rules and possibilities for each token. LUXY Marketplace reads the information and enables users to transact the NFTs from the collections listed on LUXY.
The purpose of LUXY Marketplace is to be an open market for NFT commerce. If your project has an NFT Smart Contract already deployed you can list it on LUXY if it is compatible.
Yes, you can add as many collections you want to the marketplace! Please note that you can configure and customize only the ones you own or manage.