.hbs is not Handlebars…?

So today I learned something that, for some reason, I had not well until now… Ember doesn’t use [Handlebars](https://handlebarsjs.com/guide/), but rather _something similar and close but not the same as Handlebars_. Thank you @NullVoxPopuli for calling my attention to it!

As some that has passed the last year or so looking at the official Handlebars documentation to understand what features do I have access to (for example, [whitespace control](https://handlebarsjs.com/guide/expressions.html#whitespace-control)), I was baffled to realise I have been looking at the wrong place. This lead me to think: do we have something like [this](https://handlebarsjs.com/guide/), a guide/documentation of what we can and cannot do inside an `.hbs` file?