# Advanced - token standards & smart contracts

NFTs tokens standards (ERC20-ERC721)

[https://hackernoon.com/non-fungible-token-nft-standards-an-overview-w71y34y3](https://hackernoon.com/non-fungible-token-nft-standards-an-overview-w71y34y3)

NFTs smart contracts (what are they)

[https://medium.com/lansaar/nfts-and-smart-contracts-6c4c5516d5a0](https://medium.com/lansaar/nfts-and-smart-contracts-6c4c5516d5a0)
