Many of us would not be even aware of what Web 1.0 or Web 2.0 are?
If you do then I applaud your depth of knowledge. But for the people who just got aware of the terms do not worry it is an evolution phase division of the Internet.
Web 1.0 was the 1990 era when dial-up modems and other initial technology came and Web 2.0 is the current era where social media and other Internet-driven technology are being used.
In these eras data was always the most important thing and the ownership of it was kept with the maker of a website or app that was centrally stored resulting in high power with a few. But in Web 3.0 it would be decentralised or so the flag bearers of it are advertising it.
Let me explain with an example, in Web 2.0 if you are on a social media app then even when you deactivate your account the data remains stored or you cannot transfer it to another app. In Web 3.0 you would be able to do so as ownership and storage are decentralised and these apps are called Dapps. This does sound promising but so did all the data privacy promises when we accepted the terms of Web 2.0.
In the end, most Web 3.0 Dapps today are backed by very few venture capital firms that will not leave much space for the tag of decentralisation. This does not take away that the next phase of the internet is not coming or you should not be a part and scared of it. But do not take it as advertised and keep calm.