Centred Title in Heading 2
Subtitle in Heading 3 (if required / warranted)
Main body in Paragraph 1. Preferably left aligned ...
Position text elements so that one immediately follows its predecessor and use an initial blank line in the successor element to maintain an appropriate spacing.
Append a blank line to the final paragraph of a text element to allow each section to be of minimum length and maintain spacing with the next section.
Use Heading 3 for Section Headings
And Paragraph 1 for the section body.
Use a new section for each new section heading and repeat until done.
Another section body ...
Use Heading 4 for subheadings within a section
And Paragraph 2 for longer / more detailed content
Section Naming and In-Page Menus
Name each section to enable an in-page menu a easy navigation between sections. See top-left for an example ...