each page should have at least one h1 tag and then a follow a logical structure. There are hundreds of SEO guidlines availabe in www which share recommendations and best practices. (e.g. https://www.semrush.com/blog/h1-tag/)
You need to take care about the logocal structure as h-tags can be maintained in headline elements as well as text & media and other content elements. So the h-tag structure should be checked for the complete page and not for just single content elements.
Header Style
This elements represents the CSS styling for the header, means e.g. a header can be configured as h2 but still have a styling like h1 by using header Style "Title 1"
so it's the visual representation of the header in the frontend independent from the source-code related html tag.
Alignment
This elements represents the alignment of the header
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