why we update the blog on a website?

If you have something which was left to be added in the blog, you can update it. For example, if you have written post about SEO in 2018 and you find something trending which is missing when you wrote it, you can update it so your users have something worth the visit.
 
People refer to well written blogs for quality and authentic content and therefore updating your blog may help you earn the trust of readers for your content. Regular updating may help you earn loyal readers and higher traffic, thus a higher ranking. Afterall content is king and king needs to change with time.
 
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