https://blog.ymirapp.com/wordpress-page-caching-with-cdn/, we looked at WordPress page caching using a https://en.wikipedia.org/wiki/Content_delivery_network (CDN). This is an essential tool for speeding up a WordPress site at a global scale.
With https://ymirapp.com, you get a https://aws.amazon.com/cloudfront/ (Amazon’s CDN) distribution set up to do page caching on production environments by default.
A CloudFront distribution is the entity representing our configured CloudFront CDN with its origins and cache behaviours.
You want a default cache time that allows you to feel like the WordPress site responds to changes, but long enough to cache meaningfully.