About google adsense

About google adsense, a bit confused as well because when you first look for information about google adsense that I can is a very high complexity due to the requirement that I read from a variety of information from blogs and other sites is that if your blog or site that we manage to put google ads must have enough posts but why my blog which only has one post and just 2 days and already there are adsense widget in dashboard tab menu also monetize your blog, keep what I have read the terms of that information, whether google has changed requirements and an assessment of who has the right to put ads on the blog, until
It was not immediately able to explain, or did I just lucky.