Add custom node content to cache I have added a few custom nodes to my website via the admin CMS. I wanted to know if I would have to explicitly add them to cache or if the nose_save or one of the internal drupal methods would add it to cache? I am using memcache for my caching purposes.
Generally, Drupal caches pages for anonymous users. This is true for all nodes. You can turn this, together with some other caching settings, on and off at admin/config/development/performance

If memcache handles the data that otherwise goes into cache_page, then you will benefit from memcache in returning nodes.