Solidity and NFT for Beginners ( Learn, Create and Sell)

The remix is most commonly referred to as Remix IDE (Integrated Development Environment), although this is somewhat of a simplification. It is an open-source web and desktop application, a development environment if you will. It packs a rich set of plugins and fosters a fast development cycle via intuitive GUI. Moreover, Remix IDE is primarily used for the entire process of smart contract development. In addition, it serves as a playground for teaching and learning how to use the Ethereum network.

Let's talk about variables. Variables are a fundamental concept in computer science. So what are they? let's say, you're helping your parents move out of their home, the thing is they haven't bothered packing anything yet. They want you to do it for them because they finally think you're useful!!, for once, as you're packing, you can think of the boxes as variables you can put anything you want inside and replace it later with something of the same category then you would label it. So, you know what that box is being used for, later on that way when mom asks you where the pictures of our favorite son are? you know what box has the pictures of your brother. A variable works the same way as this metaphor, there's storage locations with assigned names that hold data that you can use and change later on. Like a box, a variable can hold a whole variety of categories. In programming these things would be known as data types. A variable's data type determines the type of data that it can hold hence the name data type.

An array data type stores the reference where the actual array element is stored. By using the index location, the desired variable can be accessed. The array size can be fixed or dynamic.

Enums are the reference data types in solidity. Enums are a way of creating user-defined data types, it is usually used to provide names for integral constants which makes the contract better for maintenance and reading. Enums restrict the variable with one of a few predefined values, these values of the enumerated list are called enums.

Structs in Solidity allows you to create more complicated data types that have multiple properties. We know that solidity has two data types, but using struct we can define our own types. Structs can be declared outside of a contract and imported in another contract.

Mapping in Solidity acts like a hash table or dictionary in any other language. It is used to store the data in the form of key-value pairs. A key can be any of the built-in data types but reference types are not allowed while the value can be of any type.

ERC stands for Ethereum Request for Comment, and 721 is the proposal identifier number. ERCs are application-level standards in the Ethereum ecosystem. They can be a smart contract standard for tokens. ERC-721 is an open standard that describes how to build NFT (Non-Fungible tokens) on EVM (Ethereum Virtual Machine) in suitable blockchains. ERC-721 is a standard interface for Non-Fungible tokens and it has a set of rules which make it easy to work with NFTs.

we’ll install metamask chrome add-ons and add goerli to the network. Let’s see how to do it.

we have successfully created metamask wallet and connected it to goerli test network. But we don't have any ether in our wallet. For testing purposes, goeril provide us with some free ether. In step 2 we’ll take a test ether from goerli. Let’s grab it.

we’ll write our own contract which we’ll deploy to Goerli. So, Let’s write our contract.

we’ll deploy our contract to goerli testnet.

IPFS stands for Interplanetary File System. It is a protocol and peer-to-peer network for storing and sharing data in a distributed file system. It is a distributed system for storing and accessing files, websites, applications, and data.

Before writing our NFT contract, we need to host our art and create a metadata file. In this part, we’ll learn how to do it. To host an art I’ll go to the pinata cloud website by typing the following.

In the previous lessons, we deployed our contract using the metamask wallet and also upload our art to the pinata cloud. In this lesson, we will MINT our contract and see the NFT in “opensea“ which is the largest NFT market.