Here is a quick guide for those that were familiar with Blackboard, and how those terms translate to what we use in D2L.

 Blackboard Term

Desire2Learn Term

Welcome Page Landing Page
Course Shell Course Offering
Course Information Content (Look for course outline)
Course Documents Content (Look for various modules)
Assignments Assessments
Discussion Board Discussions
Assignment Submission Tool Dropbox
Announcements News
Discussion Board: Forum, Thread, Post Discussions: Forum, Topic, Post
My Grades Grades
Group Pages Groups
Test Quiz

This chart is also available in PDF to download.