All good SEO starts with keyword research. Even if you already have a topic in mind, some quick keyword research can mean the difference between no organic traffic and a few hundred or thousand extra visitors per month. But how do you find the right keywords to target? Even if you do happen to find a good keyword, chances are high that all your competitors already know about it.
Time to get more specific. If you have some rankings already, look at the other sites ranking for the same keywords as you. If not, start searching for keywords you think might be a good fit.