Contextual Menus show up when you
right + click (Windows) or
Control + click (Mac Os) on objects in your layout. They change depending on which object you have selected. They are very useful as they show you options that are related to what you are doing, for example the Drop Shadow option when you click on a shape or an image, and they also save you the time to go all the way up to the top of your screen to the Menu Bar.
This tutorial on the Adobe InDesign Work Area and Palettes is the first lesson of the Adobe InDesign Basics class. We will explore some of the more advanced features of InDesign later on in this course, so don't miss the rest of it. If you have any question on this lesson, post them in the DTP Classroom.