Drupal

Drupal 10 is running with same code base as Drupal 8 and 9

path auto, meta tag. simple sitemap, ctools, quick node clone.

Theme handles the presentation layer of Drupal application.

Drupal module means an extension that can be used to extend the core functionality.

This is the simple example of how to find the contents based on latitude and longitude from a certain distance.

Services are used to handle the operations in reusable way. Services are the core part of dependency injection in Drupal 8. Dependency injection is the technique where by one object supplies the dependencies of other objects. Services are decoupled ie, changes made to one system will not affect to any other systems that bounds to.

Plugin is everywhere in Drupal 8. The plugins are inevitable while developing Drupal8 portals. Plugins are OOPS replacement of info hooks (D7) and any hooks associated with info hooks. Eg: Blocks, Views etc