Generally all will think Comments are just opinions of that particular posts or articles,but comments are very much useful in making our website first page in our search engines,
Surprising !! Yes comments make every website better in search engine optimization,So comments plays a crucial role in SEO and also in page indexing,
Here comments contains more information like it gives notification about other blogs,if you post or publish any article then it gives ping back to that particular websites or channels
You can make your users to comment on new articles of your website,this gives a user new encouraging and genuine reviews of that so wordpress blog writer can really get what he have to write according to taste of his users or readers
Here in discussion settings you can even edit whom you have to approve for example you not only want simple user name but you need his e-mail and name then you can keep his credential oriented comment
So you can have a chance to get interact with him for sending news letters or subscriptions of your website
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Suppose of you don;t want your older posts to get comments,then you can keep time limited comments like older than 3 months old post you can not comment,so by keeping this rule you can skip some of unnecessary comments.
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arrangements of comments :- you can arrange comments of your own wish like newer comments to be displayed first,otherwise post popular comments first,so by re-arranging like this we can easily organise our comments