Now that you have a good idea of the target audience(s), we want to dive into some particular targeted keyword research. You can categorize keywords based on your site topics your site. If you're covering several topics or you have an extensive website that's covering several topics, you need to create a different worksheet for each main topic that has several subtopics within it.
Feel free to make keyword tabs for as many topics as you want and don't be afraid to make as many categories as you wish. Ditch out those keywords that are not relevant or that are not being searched for once you've done the keyword research. You could use keyword tools that allow you to create and store keyword lists like Keyword Discovery or WordTracker