hello. i would like to start doing some blogging to get relevant backlinks to my site, but i dont want to waste time with those that employ the usage of the nofollow tag. i need someone to explain to me what it does, how to identify it and provide examples showing me each form...(dofollow,nofollow). this has to be a very in depth explaination,along with the answering of any questions that might arise. i would provide a couple search result urls and have you go down the list and identify which are good to comment on.
person must be very fluent in english.