in my last composer training i figured out two enhancements for future training manuals:

• Lesson 4 - Exercise 6 : you want the student to add a red arrow but that has not been trained in the lesson before. -hence you should include some of these markups in the lesson before.

• If you are looking for a sample to use the explode-geometry tool, you can maybe use this example:

In order to change the color of these 2 faces the user has to explode the geometry before he can apply the red color.

This gives the end-user another possibility:
using the custom-rendering technique he is now able to raise the priority of these two faces to bring them forward and highlight the slot:

The whole picture can be finalized by adding a depth of field to focus on the relevant area of the image:

(in order to accomplish that task the end-user has to disable the custom-rendering to set the "focla point" (in custom rendering that command is disabled for some reasons...)

best

Dominik