A:- How to manage Body Typography?
(a) From your dashboard , go to the Appearance > Customize > Typography > Body Typography
(b) Here You can manage Font Family, Font Size, Line Height, Letter Spacing, Font Weight, Font Style, Text Transform & Text Decoration.
(c) Click on Publish.

B:- How to manage H1 to H6 in Headings Typography?
(a) From your dashboard , go to the Appearance > Customize > Typography > Headings
(b) Here You can manage Font Family, Font Size, Line Height, Letter Spacing, Font Weight, Font Style, Text Transform & Text Decoration.
(c) Click on Publish.