Best technique for what? Blog comments are good to get some mentions here and there. Your site's fate actually depends on the quality content and how useful it is for your visitors. Hope it helps!
If you actually read the blog and you leave insightful comments regarding the topic of the article they can certainly be a great technique. This will allow you to possible get visitors from the same niche plus you can start to build a reputation for yourself if you are regularly leaving great comments. I hope this helps!
Did you translate that with Google translate?... What do you mean with "best technique"? Best for what? SEO? If you meant for SEO then I'd say no.
If you are looking it for link building purpose, then forget it. It's really spammy. It can help you in getting mentions.
publish article on directory site / create guest post. it will powerfully help for getting backlinks.
If your comment is awesome, the blogger will figure out who you are and what your site it about. Then, they should realize that your site is also awesome and become a fan. Comment to build relationships and advance discussions. Not to build links.
Usual blog commenting would be a waste of time especially if you use outsourcing spammy blog comments .
If the comment relates to your answer, then sure. But, if its irrelevant and looks spam, then shame on you.
yes,i agree blog comment is the best techniques to get quality backlinks but it will take time to get approve and if you commented on highpage rank sites and with your relevant sites it will helps to improve your keyword ranking.
Blog commenting is good option, but don't do it only for the sake of links. If you find anything blog or article interesting, or the stuff helpful in anyway, then you can put your views
In Blog commenting , If there is four option like name ,Email.website,and Description, then it will be helpful to create a link to your website, So take care of it, while your commenting on blog.