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And i also want to know that can i use multiple headings in one article like h1, h2, h3, h4...?You shouldn't have more than one h1 on a page. (For arcane historical reasons, most of my pages start at h2 with no h1 at all; this single factor by itself can't possibly be enough to destroy SEO.) In general, think of it as a pyramid structure: there will be more h3 than h2, more h4 than h3. But don't feel obligated to continue all the way down the line. An article might have only one section that's complex enough to go all the way down to h5 and h6, so there won't necessarily be more of them overall than the h2s and h3s. Each number is subordinate to the ones before. But some sections might be missing the subdivisions that you've assigned to h3, so you might jump straight from h2 to h4.
Is it recommended to use heading tag in sequence