At first sight a short list of “related posts” shouldn’t make any negative impact on your website. That is why people create plugins to show related posts and to keep visitors on your website as long as possible. There are no negatives as long as it is a short list but if you have a list of 200 links it may impact your website.
To have two or five links is not so bad and there is no need to be afraid that you may lose your page rank. Users can find that really helpful. I use “related posts” plugin on my blog for a long time so users can find useful related posts. This way they can spend more time browsing your website.
You can look in Google Analytics and find your bounce rate. That can tell you a lot about your website. Things like “related posts” give people a good reason to stay on your site and help them explore and find more of the great content on your site.
In my opinion, it is very useful. Just think about Youtube. You can watch any video you want and then you see all of these related videos on the right side. So you can entice people to spend more time on your website and show related videos or related posts, that can be a great thing for them. People can learn more and it could be a good thing for you as well.
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