1.) Decentralized internet allows smaller competitors a chance to capture a larger portion of their industry’s market, potentially undermining centralized tech giants like Facebook and Google who currently have a monopoly on web services. In addition, because it’s decentralized it is user-driven and is therefore censorship-resistant. One other benefit of web 3.0 is that it incentivizes early adoption of a product or service; if that product or service ever becomes popular, its token will increase in value, which will drive further adoption.
2.) A token is a form of digital currency created by a smart contract, used to power the execution of dApps on a blockchain network such as Ethereum. In this case, the smart contract creating a given token has to be given Ether, which will then be converted to the specified token and paid out as specified in the smart contract.
3.) A token can be created in a number of ways (there are websites and apps that will do it for you) but at low-level, a smart contract must be written that takes in a specified amount of ETH and turns it into tokens, paying those tokens out to certain addresses specified in the smart contract.