Solidity and NFT for Beginners ( Learn, Create and Sell) | Free Udemy Course

Hello and welcome to your path of Learning Solidity and NFT. This course is for complete beginners so we will start from scratch and we will understand the basic concepts first.

In this journey, I will guide you through this course. You will not only learn but also, you will be able to create your own NFT collection after the course.

An NFT is a digital asset that can come in the form of art, music, in-game items, videos, and more. They are bought and sold online, frequently with cryptocurrency, and they are generally encoded with the same underlying software as many cryptos.

Let’s see the difference between ERC721 and ERC1155

Now we are going to talk about the future of NFT. I’m going to give you some examples of NFT use cases that might provide real tangible advantages to you in the near future and we're starting right now,

There is no doubt that non-fungible tokens are a completely new type of digital asset. It looks like a very good idea to set up an NFT marketplace of your own. NFT is the evidence in the proof of ownership. Since NFTs are on a blockchain network, they can help in associating ownership to a single account. Most important of all, NFTs are indivisible and could not be distributed among multiple owners. At the same time, the ownership advantages of NFTs ensure that buyers are safe from the concerns of fake NFTs. NFT relies largely on the uniqueness of the tokens. NFTs are created on the blockchain, thereby implying the association of unique records with them. The unique traits of NFTs showcase their potential for contributing value. Non-fungible tokens are undoubtedly one of the next big things in online commerce. The continuous growth in the demand for NFTs is a clear sign of the formidable popularity of non-fungible tokens.

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.