Every hero have 3 branches of skills, and this branches are different for every different race. Some are used for leading armies and another for governing cities. This on the screenshot is a Broken Lord hero. Broken Lords race emphasize on dust(money), so the upper skills are so nice +15% dust. Also every hero starts with some natural skills, which are generated at random. They are very important if there is a number of 2 or 3 near that particular skill. For example the Dust Boost 2 skill will give +2 dust on population!