If you read almost any book on internet marketing, you’ll be told to research your keywords.
OK, but where to start and which keyword tools should you believe?
If the book you’re reading is old (or at least old in internet marketing terms), you’ll likely see a reference to Overture. This used to be Yahoo’s keyword tool but it is no longer around.
So you can use a free tool like Google’s keyword tool. Or you can use a paid-for service like Wordtracker.