If so explain in detail on how to comment.
yes commenting on blogs is useful. The first good thing about it is it gives you backlinks. One of the best ways to get backlinks from high ranked pages. There are many popular blogs online that have high PR, depending on that when you leave comment, you place your website URL there. About keywords. Try to use keywords in your anchor text. usually blogs have username as anchor text. So use keywords there. The other thing that is important is that your comment should be funny, interesting or interrogative. Do not write 3-5 words like thank you for the information or it is great. Try to place something interesting, or you can ask the author for any doubts or you can comment on others comment and so on. sometimes the readers are interested in who the comment is from and might visit your site. just drop in your views. leaving comments on blogs have never harmed anyone.

That depends on how they have the blog set up. If you look for Wordpress blogs that have the Do-Follow and KeywordLuv plugins installed, you will get major backlinks with keyword anchors. Do a search to find a few and try it.
References :
If the blog has a do-follow link then yes, you will get a back link from this blog, you can find it only in WP blogs. All the blogger blogs have no-follow on them.
To gain the backlink, you comment should have quality, don’t spam the blog, and add some interest to it
References :
http://www.learn2earn2.com
yes commenting on blogs is useful. The first good thing about it is it gives you backlinks. One of the best ways to get backlinks from high ranked pages. There are many popular blogs online that have high PR, depending on that when you leave comment, you place your website URL there. About keywords. Try to use keywords in your anchor text. usually blogs have username as anchor text. So use keywords there. The other thing that is important is that your comment should be funny, interesting or interrogative. Do not write 3-5 words like thank you for the information or it is great. Try to place something interesting, or you can ask the author for any doubts or you can comment on others comment and so on. sometimes the readers are interested in who the comment is from and might visit your site. just drop in your views. leaving comments on blogs have never harmed anyone.
References :
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