How Do you know if a web host will keep its promises?

For example, I see a lot of posts that say unlimited bandwidth, multiple domain names as an add-on, and things like that

I really don’t know anything about web hosting. All I want is a simple web host, that is affordable, let me have three or more add-on domains, can host a blog, it can grow with me . eventually I would like to have a shopping cart, and so on. I don’t want one that goes down all the time.

It all seems to have a really good template because I have zero programming skills.

I’m overwhelmed with what’s out there. I don’t know who keeps their promises, or who’s best to go with. How easy is it to change hosts if I pick the wrong one?

I guess I’m just too new at this, and I don’t know where to find the answers I need. Any thoughts?