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The<title>tag remains an important on-page SEO factor. According to Moz, <title> tags that start with a keyword tend to perform.If Google thinks you're spamming keywords in your <title> (and <meta> description) tags in an effort to game the algorithm, they may penalize your site.
Google doesn't use the <meta> description tag directly. However, it can impact click-through-rate, which is a key ranking factor.LSI (Latent Semantic Indexing, ie. related) keywords in <meta> tags probably help Google discern between words with multiple meanings. Duplicate meta information across your site may erase your page visibility.
Google uses your <h1> tag as a secondary relevancy signal, according to results from one correlation study. Having your keyword appear as a subheading in <h2> or <h3> format may be another weak relevancy signal. Googler John Mueller states:“These heading tags in HTML help us to understand the structure of the page.”
When used properly, the <link> tag may prevent Google from penalizing your site for duplicate content.
<link rel="canonical" href="https://my-site.com/copy-B"/>Images send search engines important relevancy signals through their file name, alt text, title, description, and caption.
HTML errors signify poor quality. While controversial, many think that a well-coded page helps SEO.
Pages with microformats (5.7) may rank above pages without them. This may be a direct boost or a consequence of the fact that pages with microformatting have a higher SERP click-through rate (CTR). The site schema.org contains a semantic vocabulary of tags that you can add to your HTML to improve how search engines read and present your pages.