Non-Fungible Tokens (NFTs) are collectible crypto-assets whose main characteristic is that they are unique, where their possession and existence is based on the blockchain. In the world of blockchain and cryptocurrencies, each piece of information is unique, i.e., we know that a bitcoin is made up of small fractions of information called satoshis. Allowing each one of them to be unique and different from the others, if it is destroyed it can never be recovered or recreated. For example, a unique collectible card is a NFT, you can not simply replace it with another card, if you change your card for another, you have something different. That is, if you trade a nearly worthless, mass-produced late 1980s baseball card for a 1909 American Tobacco Company T206 Honus Wagner card (valued at over $1 million), you've made a great trade.

As we well know, a blockchain is composed of a great diversity of information or unique blocks that form the network. Let's say that each of those blocks is empty and does not have any information but we do have the ability to write new information in them. For example, imagine you are a digital artist and you have just created a new design, you can turn it into a unique piece of art if you link it to a block on the Blockchain. This can never be replicated again and will become unique digital information. This process is known as tokenization. Now you can sell that design in a marketplace by direct sale or auction, as if it were a real painting. Once sold, you will send that information to the buyer's virtual wallet and you will lose (obviously) its authorship and possession.

NFTs are born with the objective of allowing anyone to virtually represent any type of item, both real and intangible, including: Art. Virtual items in video games (skins, coins, weapons, characters) Collectibles (cards, stamps, postcards) Web domains Real tokenized assets (houses, vehicles, designs, etc...) Virtual land. Videos of iconic moments. Memes

NFT's marketplace.

The NFT market I would like to choose to buy/sell would be video games as the NFT field within the gaming world has started to get a lot of attention. For example, an RPG or role playing game may use NFT tokens to represent in-game items, some of these items may be quite rare, which would make it very valuable to players, due to the fact that very few can get to have it, meaning that there are limited quantities of these highly valuable items around the world. Usually these games include a marketplace to trade these items. So; if you can put together a high-value item, a market and create a supply/demand dynamic you are already creating a very good in-game economy. This can generate huge profits for the game company, even if the game is free-to-play (F2P).

For example, games like Minecraft, Fortnite, Counter Strike GO or World of Warcraft have in their digital art quite expensive elements, speaking in terms of real money. So we are facing a way to further monetize these games. If additionally, an NFT element is added, the possibilities at this point are practically endless.

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In order to purchase NFT Tokens we must:

• Choose the marketplace where we are going to buy the NFTs.
• Have a virtual wallet compatible with the chosen marketplace.
• The cryptocurrency you need to add funds to the wallet and be able to buy NFTs in the marketplace.
• These three elements must be compatible with each other and may vary depending on the marketplace and the blockchain with which they are compatible.

Some NFTs may only be available in a particular marketplace. Imagine that you enter a marketplace based on the Tron (TRX) cryptocurrency blockchain and you see an NFT that you want to buy. In this case, you would have to create a virtual wallet compatible with the tron cryptocurrency (TRX), deposit the TRX cryptocurrency in that wallet and connect it to the compatible marketplace. Something you should be aware of as a buyer of NFTs are the packs and the sale date. In many cases you will see that an NFT has a predefined date and time when it will go on sale. This method has become incredibly popular in the markets and generates a great deal of buzz among buyers. Such NFTs when they go on sale usually sell in seconds, so ideally you should have a wallet already set up and with sufficient funds to make the purchase before the NFT's release date.

Here is an example of NFT purchase on the Rarible platform: Let's see an example of Non-Fungible Token purchase on this platform. We enter the website and click on the "Explore" button. A virtual store type screen will appear like this:

To buy, we simply search for the NFT we want to obtain and click on "buy now", then click on the "checkout" button in the pop-up window. If we have enough funds in our wallet, we digitally sign with our wallet and that's it, the NFT will appear in our collection and we can sell it a in the future or keep it.

On the right side of the screen we can see all the details of the NFT such as its creator ("owner"). On the right side we see its price next to the "Buy Now" button. Underneath we have details such as the historical price ("Price History"), details of the listing for sale in "Details", the offers it has received from buyers in "Bids" (here we can make an offer using the "Place a bid" button).

Once we follow the steps to buy the NFT we want to have, it will appear directly in "my items" once our ETH transfer is effective.

To transform a piece of digital content into an NFT, creators must first mint it on the platform. The first step to being able to acquire our NFTs is to connect your MetaMask wallet, which can connect to any DeFi protocol. This makes it extremely easy to switch between Dapps, as if you were on a single platform switching between tabs.

Once logged in, to create and sell NFTs, we must click on "Create". This will open a new window asking us if we want the NFT to be "single or multiple''. The former allows us to create a single token (ERC-721), while the latter, multiple tokens (ERC-1155), depending on the amount the user chooses to release into circulation. Of course, the rarer it is, the more limited its supply will be, which is likely to raise its price. As implied by the platform's nickname "Rarible".

Once you fill in the price, name and listing description, we proceed to upload the asset (video/audio/image), and the Rarible platform will recreate it as an NFT on the Ethereum blockchain. The NFT will be transferable between all Ethereum compatible wallets.

Among the items to fill in, there are the "Royalties", an option where we will be able to choose the percentage of profit to be received in the future, when you sold the token. Who knows, an NFT you bought for 1 ETH could be worth 100 ETH later on. The nature of NFTs is that they are highly speculative assets, mirroring the traditional world of art galleries.

Next, the Metamask pop-up window displays, from where we confirm the fee collection. At this point, if we choose to put the collectible up for sale immediately after it is created, the application may also ask to "Sign the sell order", which means that the NFT will be displayed on the Rarible market at the price we have chosen.

Remember that you will need to have enough ETH balance in your wallet to cover the transaction fees. The 'Gas' fee can be modified within the wallet under 'Edit', from where Metamask allows the user to choose the speed of the transaction, paying slightly less fees for a slower transaction.

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Mention and explain the advantages and disadvantages of the NFT market you have chosen

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Conclusion

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Thanks you professor @levycore, most of the images belong to me, but some do not belong to me. Since I don't have a Metamask wallet to be able to make the screenshots