do follow and no follow rel tags are for search engine bots to tell them which link they should pass the link juice and which not. The users can definitely click and pass through to that site but it does not pass through the link juice. The bots also travel but they do not index a page if it is not already indexed. there is one further thing, I am in search of and that is that if google does not follow the nofollow rel tags, then why does it show them in the google webmaster tools. facebook and wikipedia are nofollow and you can find your site getting a backlink from there.
What is robots.txt file? its help to SEO or not? What is htaccess file? how to create a file to windows server? how its help to SEO? If your sites got lots of bad review then you how you removed? Loading time will help to SEO? why? how? What is SEO? Why i need optimize my website with SEO? Apart from SEO marketing, any other way of online promotions? do you know? What is affiliate marketing? What is SMO?