Heading hierarchy
Using H1 to H6 as a real outline, not as font sizes, so screen readers and skimmers can jump around the page.
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What it is
Headings are not font sizes, they are an outline. H1 through H6 nest like chapters and sections, and screen reader users navigate by jumping heading to heading (in VoiceOver and NVDA it is literally a keystroke) the way a sighted reader skims bold text. Get the levels right and the page becomes a table of contents. Get them wrong and it becomes a wall.
The working rules: lead with an H1 that names what the page is (one is the convention and a safe default, not an HTML or WCAG rule, and a document that genuinely holds several top-level sections can carry more than one), never skip a level going down (an H2 followed by an H4 leaves a hole in the outline), and never pick a level because it looks the right size. Size is CSS. If your section heading needs to be small and quiet, style an H2 to be small and quiet.
Two traps. First, marketing pages love styling a big chunk of body copy as an H2 for visual punch, which drops a fake chapter into the outline. Second, headings that read fine next to their content ('Overview', 'More', 'Details') are useless in a heading list stripped of context, so write them to make sense read back to back.
Ask AI for it
Audit and fix the heading hierarchy on this page. Go through every chunk of text that is styled like a heading and classify it by structural purpose first: does it title a section of content that follows it, or is it display copy that just happens to be big? Mark the genuine section titles as headings at the level their nesting implies, and leave the purely decorative lines as ordinary text. Keep an H1 that names the page (one is the safe default; use more only if the document really does have several top-level sections), nest H2 and H3 in order with no skipped levels, and never choose a heading level for its size: move all sizing to CSS classes so an H2 can look small. Then rewrite vague headings so the list of headings alone reads as a table of contents.