Hi Manos,
I noticed the title of the post here and I thought you would like to know it’s in the bonus section.
The reason for this is its more of a beginner to an intermediate level subject so needed to be a bonus section so that new users to blender do not get overwhelmed early in the course.
Another reason is that this section links in with the bowling section of the unity course version 1.0 so the physics are applied in the game engine there.
You can always revisit and apply the knowledge you learn there.
Hope this helps 
Ow thanks for the info, can’t wait to try it out 