This page contains information related to default Drupal 7 installation folder strucutre and related information.
Cache has been used for the site or system to improve the content delivery fast for the end-users. This topic is created to explore about Drupal inbuilt caching mechanism and provide info how to use it. We need to explore Drupal's inbuilt caching feature with the external contributed modules like Varnish, Memcache, Authcache, File cache etc. those are available to improve the site performance. You can found the best suited example and caching options to use with your site in this topic.
The Entity System in Drupal 8 allows developers to easily create custom content types and model data relationships around these types.The extensive API provides support for form generation,data validation,configuration,routing and a lot of other features.