Creating an NFT (Non-Fungible Token) marketplace involves several steps, including creating a smart contract for the NFT, implementing minting functionality, and building the marketplace platform. Below, I'll outline a basic guide to creating an NFT marketplace using real-time code for the smart contract:

1. Set up your development environment:

   • Install necessary tools like Node.js, Truffle, and a code editor.
   • Initialize a new project directory for your NFT marketplace.

2. Define the NFT smart contract:

   • Write a Solidity smart contract defining the structure of your NFT.
   • Include functionalities like minting, transferring ownership, and viewing NFT details.
   • Here's a basic example of a Solidity smart contract for an NFT:

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

import "@openzeppelin/contracts/token/ERC721/ERC721.sol";
import "@openzeppelin/contracts/utils/Counters.sol";

contract MyNFT is ERC721 {
    using Counters for Counters.Counter;
    Counters.Counter private _tokenIds;

    constructor() ERC721("MyNFT", "MNFT") {}

    function mintNFT(address recipient, string memory tokenURI) public returns (uint256) {
        _tokenIds.increment();
        uint256 newNFTId = _tokenIds.current();
        _mint(recipient, newNFTId);
        _setTokenURI(newNFTId, tokenURI);
        return newNFTId;
    }
}

1. This contract uses OpenZeppelin's ERC721 implementation for NFTs.

2. Compile and deploy the smart contract:

   • Compile your Solidity smart contract using Truffle or a similar tool.
   • Deploy the compiled contract to your chosen blockchain network (e.g., Ethereum, Binance Smart Chain).

3. Implement minting functionality:

   • Create a front-end interface or API endpoint for users to mint NFTs.
   • Utilize web3.js or ethers.js to interact with the deployed smart contract.
   • Here's a simplified JavaScript example for minting NFTs using web3.js:

const Web3 = require('web3');
const contractABI = require('./MyNFT.json'); // ABI of your deployed contract
const contractAddress = '0x123...'; // Address of your deployed contract
const web3 = new Web3('https://mainnet.infura.io/v3/YOUR_INFURA_PROJECT_ID');

const myNFTContract = new web3.eth.Contract(contractABI, contractAddress);

async function mintNFT(recipient, tokenURI) {
    const accounts = await web3.eth.getAccounts();
    await myNFTContract.methods.mintNFT(recipient, tokenURI).send({ from: accounts[0] });
}

// Example usage:
mintNFT('0xRecipientAddress', 'https://example.com/tokenURI');

1. Build the NFT marketplace platform:

   • Develop a user-friendly platform where users can buy, sell, and trade NFTs.
   • Implement features like browsing NFTs, creating listings, and managing collections.
   • Integrate wallet connectivity for users to manage their NFTs.
   • Ensure security measures are in place to protect users' assets and data.

2. Test thoroughly and deploy:

   • Test your marketplace platform extensively to identify and fix any bugs or vulnerabilities.
   • Deploy your marketplace platform to a secure hosting environment.

This is a basic guide, and building an NFT marketplace involves more complexities, especially regarding user experience, security, and scalability. Make sure to consider legal and regulatory aspects as well, depending on your jurisdiction. Additionally, keep your smart contract code and platform code up to date with the latest best practices and security standards.