What are your thoughts on Google Keyword tool?
 

I have some questions with regard to the keyword tool of Google. A colleague has been working on a webpage for quite some time now in order to improve the position or rank of that webpage. I think I was able to select the appropriate SERP process because within one month, 100,000 search terms have come up and I was surprised to learn about these keywords. Thus, I am not sure about Google Keyword tool. Also, I am uncertain whether it is a good decision to study the particular area. Do you think doing such will be useful?