One of the best sources of data that can help you build out a winning SEO content strategy is competitor analysis. Competitor analysis will reveal topic and strategic opportunities.
Find Unexplored Content Opportunities
Once your site has a substantial body of content you can easily find gaps in your content by comparing the keywords your direct competitors are ranking on and the keywords your site is ranking on. This can give you a wealth of opportunities.
Find Weaknesses in Your Competitor's Content Strategy
When analyzing your competitor's keyword rankings you can easily find weaknesses in their strategy and that means big opportunities for your site. If you double down on these topics you could easily dominate the SERPs.