Overview of the ERC721 NFT standard

In Chapter 7, ERC20 Token Standard, we looked into the ERC20 token standard, which is the standard that's mostly used for minting and transferring the tokens. However, the ERC20 token standard has a state variable, decimals, and by using that variable, each token of the token contract can be fungible to the defined number of decimal places. For example, an ERC20 token with 18 decimal places would enable each of its minted tokens to be fungible up to 18 decimal places. The Solidity language does not support decimal or floating data types; hence, one full unit of a token will have 18 zeros followed by 1, which we can also refer to as 1¹⁸ or 10 * 18.  These tokens are also identical to each other, which means that one token is equal to another token. For example, if there are two people who both have 1 OmiseGo...