# Fundamentals

- [Customers](/fundamentals/customers.md)
- [Shop Owners](/fundamentals/customers/shop-owners.md)
- [NFT Item Holder](/fundamentals/customers/nft-item-holder.md)
- [Registered Customers](/fundamentals/customers/registered-customers.md)
- [Free Viewers](/fundamentals/customers/free-viewers.md)
- [Marketplace](/fundamentals/marketplace.md)