Images (example above) can be referenced from the assets folder with the folllowing code:

Chapter 1
How to do local development
Video plugin shortcodes
Youtube: {% video %}https://www.youtube.com/watch?v=Oru-qw-Faac{% endvideo %}
Vimeo:{% video %}https://vimeo.com/128858567{% endvideo %}
links
Internal link 2: Chapter 2