Basic Caching Out of the Box
Out of the box, your section.io Varnish configuration will cache static objects. It will observe the HTTP headers already set in your application to decide if an object is cacheable or not.
section.io metrics will show you the object hit rate for each environment (development, test, staging and production).
As you develop your web application code you can observe the hit rate in each environment so you can work out if the web code you are building has the best HTTP headers for cacheability.