Top 3 Google keyword tools for better ranking

We, webmasters run websites or blog and we update its content regularly. But without traffic your blog is just like a graveyard. So we need to do some analysis and research before writing a article.
Google offers some keywords tool for Adwords Advertiser but we can also use them to know popular queries and current trends on the search engine around the world and easily find What type of information people are looking.
But how to know good keywords for more traffic and higher ranking.
1) For a particular site, Visit the Search based tool and it will ask you about the site URL and the word or phrase. After the appropriate query, it will show you a complete table with Monthly searches, Ad bid price and more but it is specifically related to the site you have entered.
2) Now if you writing a new article then you need to check the search engine traffic related to particular keyword. This can be done with Google Traffic Estimator.
Just enter the phrase and Estimate on the basis of the country geographic location.
Well I looked for ‘IPAD’ and I got around 7,480,000 hits just in USA. So you can imagine the world traffic.
3) Google Insight is the Father of all the previously mentioned tools. It displays the result in the form of monthly graphs, traffic heat map, countries based popularity and shows highly searched other keywords related to a particular entered phrase. So it is better and more professional.
You can better customize results based upon the year timeline graph, categories, regions, popularity history. You can search multiple keywords at a particular time and make a comparison between them. Many SEO firms use it to get higher SERP. I suggest you to try it out.
I don’t think there is any need to use other 3rd party software because everything is available so easily from the big G itself