How will the structure of my HTML tags affect the SEO?
HTML tags will help the search engines define your page, and it gives you the chance to highlight the most important parts of it. Tags like <title> and <heading1> help to explain to Google what the page is about and gives you a better chance of ranking for keyword or long-tail keyword. Meta tags and even tags like OG tags (that help social media sites display your content well) will not directly help with ranking, but will help you drive more traffic by making the snippets more attractive to click.
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