These are often known as 'Home Pages'. It is a huge network of information, which can be hard to navigate. Information on almost anything can be found, and there are plenty of people looking. The Web is also where most people publish their own information. Imagine a public library with lots of notice boards.
People can browse around all the boards, and read notes others have stuck up.
If they are interested, they can stick up a note of their own, maybe asking a question, announcing something, or commenting on a note someone put up previously. Every now and again the librarian comes around and throws out all the oldest notes, to make room for the new ones. This is an analogy of the Newsgroup system. It is a very good way to find out specialised information, or to correspond with like minded people on just about any topic you like. Get some advice, not from a consultant or a high-street shop, but from someone who has already done it, preferably near you.