It's like if you ask "how do I drive my car downtown" and I answer, "Easy, just park at the station and take the train".

To answer your other question, their marketing goes a long way. I recently started at a new company, and the lead was proudly telling me how the project was developed using Mongo... So I start explaining how it's basically shit after using it professionally for a few years. His answer? But SQL doesn't scale well enough!