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The benefits of web 3.0 are huge. You now for the first time have protocols that have actual value. Not just the applications that are being built on top of the protocols. You now have the potential to compete with large organizations if you have a great idea. With Web 3.0 the application being built on top of a protocol will also give more value to the protocol. Value creation is not limited to the protocol or the application being built on top of it. Value creation can happen in a large variety of different ways. It is the decentralization of Finance.
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A token is an fungible or non fungible asset created on a blockchain. They can be used in a variety of different ways. There are ERC-20 Tokens, and ERC-721 tokens, and other types as well ERC-20 tokens are fungible tokens, while ERC-721 tokesn are non-fungible tokens. ERC-721 are usually used for game items or collectibles of different types.
3.You can create a ETH token using simple code inside of a smart contract, smart contracts are not required to have their own token, but you can easily make your own token to interact with the smart contracts. "Simple code can not make complex creations though, if you are wanted to make a token that actually has and maintains value, you need to add something that people find valuable.