Answer 1

Yup. I created an entire intranet interface for a company using what I learned here about web development.

This place is great for getting started on all of the courses provided, but it isn't the last stop on the bus route, so you'll want to keep riding and gather more knowledge through various resources. However, what you learn here is more than enough to get you started with creating stuff while you learn the rest of it. You can easily create some amazing things with the knowledge contained here.