Stupid question... custom content type possible?

I mean, one more time I have to speak about Kirby. It natively have the possibility to create as many custom field as needed, using purpouse made templates for each kind of content: blog could be blog.md, portfolio items as portfolio.md and so on, each one with as many field as necessary. Can I do the same with Grav? Is so, how?

Thanks!

Of course, you just add whatever custom items you want to the header. All the secrets are in here :)

Specifically look at custom page headers

I knew it was a stupid question... !!! Thanks!!!