###1. How does link_to work? What possible arguments does it accept?
link_to is a helper method that creates a link tag. Which link tag is determined by the set of parameters passed in to it. The first parameter is the text that represents the link as seen by see user. The next is a string or hash which defines where the link leads to. A third one can provide HTML attributes.
Example time:
<%= link_to "DevBootcamp", "http://www.devbootcamp.com/" %>translates to