Help with Styles - What is +Body and +Headings

[spdoffice]

Hi All,



Word 2016 (Not 365)
New to these forums, and working with Word Styles so please bear with.

I am creating my own normal document with my own styles to fit it with company logo/graphics. I will be changing fonts, sizes and colours

There are some entries in the default Normal.dotm which I don't understand what they are or if I should care. For instance:

For the Normal style I see:
+Body (Calibri)

Is there something called Body which should be updating?

For Headings 1-X I see:

+Headings (Fonts Name)

Is there something called Headings which I should be updating?

Thanks very much
Steve