"this question isn't quite appropriate for HN or even a site like StackOverFlow."

--I meant the way blocks are made/distributed so that they could be extended. For example above one had blocks like {% block title %} {% block headcss %} {% block headjs %} etc. So I wanted to know any extensive list which people might have come across. Its like asking for best practices which comes by experience for example Daniel Greenfeld book two scoops of django gives many such suggestion. So I feels is relevant for HN atleast