As of November 2016, upgrading to Drupal 8 is still largely hypothetical for a majority of digital humanities sites using Drupal because the module support isn't there yet. If a module that your Drupal 7 site uses isn't yet available for Drupal 8, and there's no new Drupal 8 module with the same functionality (and, ideally, a migration path if the module stores data), you can't upgrade to Drupal 8 without abandoning the functionality provided by the Drupal 7 module.

• 2.1 Overview
• 2.2 The Drupal community
• 2.3 What about Drupal 8?
• 2.4 Understanding Drupal’s components: code and database
  • 2.4.1 Drupal core code
  • 2.4.2 Module code
  • 2.4.3 Theme code
  • 2.4.4 Database
  • 2.4.5 Summary of code and database
• 2.5 Drupal components
  • 2.5.1 Content types
  • 2.5.2 Nodes
  • 2.5.3 Taxonomies
  • 2.5.4 File types
  • 2.5.5 Views
  • 2.5.6 Blocks