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If content is king, relevant and optimized content should be greater than king. Nevertheless we should also realize that text format is not the only type of content, where we can also have image as well as video content on our sites.
Similar to everything else in internet marketing and Search Engine Optimization (SEO), the roots of well optimized content goes back to the initial steps of SEO; keyword research, which is actually the result of competitive analysis, and marketing goal setting.
Nevertheless, even though some SEO factors are the same for optimizing content (tags, keywords, etc), we still need to keep in mind that different content requires different optimization methods.