NFT is cool. In this article, I will show you how to create a fully decentralized NFT collection on OpenSea -- the world's first and largest NFT marketplace. This article is written for technical guys, I assume you already know what is Ethereum/Polygon, Smart Contracts, Solidity, ERC721, and so on. Let's go!A Good IdeaIt all starts with a good idea. Since we will create an NFT collection on OpenSea, some cute fishes look like a good choice. I asked one of my artist friends for help,...