the 3 technologies combined gave a rise to a new revolutionary technology called NFT.
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NFTs are digital commodities traded between people as both commercial and as storage of wealth. anything can be not if you create a digital version of that item. let's say you have mango and you want to create a mango nft, first you would have to first create a digital version of it. you can do this by either taking a picture using your phone or creating your mango via animating software or taking a video. after this creating stage, you then upload your work on an nft market. the most popular market is openseanft . it's here that you set up your product price and quantity you are putting out to be sold.
NFTs are sold using blockchain, with the main one being Ethereum and other currencies. you may face gas fees while using Ethereum which is the equivalent of taxes. but if you want to trade your NFTs freely then you would have to use polygon as your principal nft, I ague you to make extensive research before taking on this new financial technology.
there is a movement saying that nft is moved by greed and one should be courteous with it as the bubble would burst as the mortgage bubble of the 2008 financial crisis. but this is what I tell you, some people gained shit loads of money both before, during, and after the financial crisis. so one should never be afraid of risk when you're in finance.