The exercise was to create a composition of a green screen clip. I took the driving actor provided by the course instructors and added a variation of Process 0 in the background:

I used Blender’s node editor for the task. This video tutorial helped me a lot! The soundtrack „The Simplest (Sting)“ by Jingle Punks was taken from YouTube’s audio library:

I’ve created a green screen screenshot summary. Good to know: A matte (alpha channel) is a black and white image that represents which part of an image is opaque, and what parts are transparent.