Features and specifications of Drupal?

Hi.
I'm doing a study on the CMS that best fits the project that I intend to develop. So can you please indicate me the sites where I can find all the properties and features of Drupal? In other words, technical specifications, architecture, features, What I can do or not do with Drupal, innovative features, ...
I looked at the official site but could not find ..

Can anyone indicate where I can find it all?

Thanks