- What is Drupal?
Drupal is a content management system that is free and open source. It’s written in PHP and while it’s not quite as popular as WordPress for the average user- it’s used as a back-end CMS for many important corporate websites including Whitehouse.gov.
- What is a node?
A node is a content type- similar to a “post” or a “page” in WordPress. It also could be a forum topic or poll.
- How do I edit pages or install/update a module?
Since a page will be contained in a node- you will need to select the node and edit it. Here is a great guide if you want to dive in to Drupal: http://sixrevisions.com/web-development/getting-started-with-drupal-a-comprehensive-hands-on-guide/