No bro but anyway you look handsome I love you do you love you

There is nothing called as DOFOLLOW. There's a term NOFOLLOW which alerts the search engines like Google that they should not follow those links.

DOFOLLOW does not exist practically, but in theory it's the opposite of NOFOLLOW and helps search engines in identifying helpful links.

In link buildong, If the nofollow attribute was built for anything, it was built for comment spam. If you do not remember, Google and the search engines worked closely with MovableType, WordPress and other blog and forum systems to help them build in the nofollow attributes to help save their search index and to help reduce comment spam.

No, <a href="thehappydeals.com" rel="nofollow">The Happy Deals</a> both are actors which working in bollywood as competitor.

Yes, completely. If Google cannot track the visitors who found the landing site via Google, then the pagerank will plummet.