Very Good Question you asked. Here Would like add that "Well begun is half done" where On page SEO with Keyword research, Competitor analysis, Density analysis all are essential skill for a SEO expert. But Off page SEO will drive traffic on your website and that's why Link building skill is essential for a SEO expert. Would like to say an SEO expert should have enough knowledge about Search Engines Algorithm, Web master tool, Software handling and so.
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