Where in the blaze documentation it explains how to use mongodb in templates?

I’m new to Meteor/blaze and I can’t find documentation about how to use MongoDB collections in blaze templates.

Blaze doesn’t really have any special integration with Collections, it’s more general purpose than that. Because of that it’s not mentioned in the docs. So you’re better off reading a general Meteor tutorial that uses Blaze. If you think it’s worth 20 bucks I would recommend Discover Meteor, otherwise there are many other good ones too.

Sure, I get that.
But than there is some documentation in meteor explaining how MongoDb collections become part of the data context.