First of all inorder to perform keyword research you need to know what are you promoting. It can be from affiliate marketing (service) or golf clubs (product).
Once you find your product or service, go to google adwords keyword tool bar to type in keywords for your keyword research. For example, if you were to type in golf clubs in the google search engine you will recieve millions of views, but it you type in a specific key phrase "wilson hope golf clubs" you will have lesser search results which is better.
My main point is the more specific your keywords are and less competition you can increase the content in your blog article and drive specific traffic to your blog or article.
For the proper keyword research training copy and paste in url: