Nunjucks (Template Engine)
Overview
According to the Nunjucks Documentation:
Nunjucks is essentially a port of jinja2, so you can read their docs if you find anything lacking here. Read about the differences here.
Basically, most of the topics here will be related to the differences between Nunjucks and Jinja. It's better to learn about the basics of Nunjucks' syntax by reading the notes on Jinja.