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The Code
Running the site in development mode, ensuring that CSS gets compiled as we need:
Rendering a partial:
<%=render("directory/partial") %>
It's important to remember that partials start with an underscore, but you don't use it when you call render.
When defining a route, you start with the HTTP verb, the matcher, and then the controller#action pair:
get 'about', to: "home#about"