Guest blogging can be a great way to improve your SEO, as it will help you build links from other websites.
However, some people believe that guest blogging harms your SEO because it can give the impression that you are not truly contributing to the site you are blogging for. If the site is a high-traffic one, this could lead to a loss of traffic and ranking. You should always weigh the pros and cons before starting a guest blogging campaign.