Moodle supports a variety of activities, including hosting of classroom documents, discussion forums, assignment dropboxes, and student grades. Each of your instructors will use Moodle in a slightly different way, but this guide will introduce you to some of the most common features.
Turnitin.com is a web-based program that your instructor may use to check your paper for orginiality. They may also use turnitin.com to facilitate a class writing workshop, where you evaluate and provide feedback on a draft of classmates' papers.