Best thing I know is just to start using it. I do think it works better on a desktop, at least to understand it. You don't have to sign up for the premium service. But it gives you chat GPT-4 and it is somewhat better for certain things.

In some ways it works a lot like search, but it is a very different tool. It can make errors and does have certain limits, but it is truly incredible at pulling out esoteric information that is hard to find.