Google does look at h tags to understand the structure of the content on the page better, Googler John Mueller confirmed this several years ago. Therefore it’s good practice to have your H1 as a main page or title of the piece then main subheadings as H2, any further sub-headings needed to divide content under these H3-H6. A lot don’t go to this depth and focus on H1 and multiple H2s achieving good results. When I have taken it further I don’t believe it has made a significant impact on rankings compared to when I haven’t.
Hope this helps
