I come across here to write an answer but I gained more info than my view

H1 should be your key centered keywords like your page's title
and H2 and h3 should be your secondary keywords

Use H1 only one time in your article. Use H2 as the headings in your article. And H3 as the sub-headings. It is not necessary to use H4

You can add heading tags (H1) just above the first paragraph of body content. It help to boost your ranking in Google SERPs.

Headers Tags plays a major role in the SEO. In any page
use only one H1
H2 for subheading in the content. we can use multiple H2 depends on the length of the content.
H3 for subheading in the content. we can use multiple H3 depends on the length of the content.
Like this we can use H4. H5 and H6.

I also Agree with John here. We should use H1 Tags for 1 time in every page because it lets know the search engine what is this page about. If you use it several times then search engine will get confused and might not consider to index your page.

Add H1 as primary keyword

prominence and proximity is right way to implement Heading tags.

Yes, only add h1 as main target keyword!

I would use H3 and H4 only.

Use H1 Tag at least 1 time and rest H2, H3, H4 etc... depends on you... but main thing put your main keyword in H1

Use single H1 tag in any page and later on you can use another H2, H3, H4.....Tags

h1 to h6......h1 means main headline.

Use H1 only 1 time in the blog and use H2 multiple times.

Use H1 only 1 time in blog no more use H1 heading in your blog after H1 you can use h2, h3,h4 for example

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Yes, make your title h1 and make sure you put your primary keyword in your title. Another facts is according search engine land post, If we feel any title useful for user, in such a case we can use h1 tags more than one time or at any position. and same for other heading tagsh2...h6. Concept is your main heading categorized under h1 or h2 heading and then h3, h4...h6.

H1 tag should be only one.
H2 tag can under H1 tag and it can be more than one.
H3 tag come under H2 tag and it can be more than one.

h1 is best for your page title and targeted keyword.
h2 is best for related keyword.

1. Use H1 only one time in your article.
2. Use H2 as the headings in your article.
3. And H3 as the sub-headings
4. Its not necessary to use H4 but you can mark the very last heading of your article as "H4" as the conclusion or summary.

Use H1 only 1 time in blog and other tags like h2, h3 use in subheading titles.