• We check to see what routes we've defined by running rails routes.
• A route is a fancy way of saying which pages in the URL, a customer can get to.
• We add a nav link using a Rails link helper (the Rails way to add links).

###Terminal

rails routes
(Before Rails 5.0, this command was...)
rake routes

###app/views/layouts/application.html.erb

...
<li><%= link_to "Contact Us", new_contact_path %></li>
...

###Terminal

git add .
git commit -m "Added nav link for contact page"
git push origin contact_form