Web 3.0 will start with cryptocurrencies becoming mainstream and blockchains being used by businesses worldwide. It will then move into people buying sensor information from smart devices in their homes and selling it to insurance companies. The next step will be when people start paying for services with computers, without requiring a third party like an internet service provider (ISP) or payment gateway.
Web 3.0 is the decentralized web that places power back into the hand of users, taking it away from centralized institutions like banks, governments, and social media platforms. In the current centralized world, our data is stored with these institutions and we have to trust that they will protect it and not use it against us. With Web 3.0, we can decentralize this data by storing it on a blockchain.