CDN and StackCache can work complementary to each other. CDN will handle static cache of static file types, whilst StackCache can handle dynamic cache.

For websites on the WordPress Platform (i.e. with StackCache), dynamic content is cached with the default expiry times set.

You can edit these values from the Edge Caching section or directly from within StackCache in the WordPress admin area. In addition, you can cache any other dynamic content using public Cache-Control and Expires headers via a .htaccess file - however, this is recommended only for advanced users only.