What is the Best Method to Use Heading Tags?

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

The best method to use heading tags is what I have found so far is actually how your article, blog or whatever you are posting appears in your desired website that you can see by reviewing its preview. But the only thing or points that you should take care of are given as:-
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 conclusio

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Use h1 tag in the main heading title and other tags like h2, h3 use in subheading titles.

Yes, only add h1 as main target keyword!

Yes, only add h1 as main target keyword!

Use H1 only 1 time in blog no more.

and use H2 multiple times as subheading. is right. h3 h4.

Use In Format.

Use H1 only 1 time in blog

and use H2 multiple times as subheading

and under H2 if there are further headings then make them H3

Use the title form to accurately represent the topic of the article you are talking about, so use more expressive words.

Use Headers to Provide Structure.
Use Headers to Break Up Text.
Include Keywords in Your Header Tags.
Optimize for Featured Snippets.
Only Use One H1.
Keep Your Header Tags Consistent.
Make Them Interesting.
Stay Ahead with Header Tags.