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2. It is very important to develop skills such as Education and Tutelage.
This is because when exchanging with other heroes, you transfer as much as 75% of the experience. Why? It's simple: you develop secondary heroes along the MANAGEMENT branch to increase gold and resource gathering, which brings you 20% more gold when picking up resources, as well as a 1+1 bonus for ore and wood. This is a good exchange rate, and most importantly, it provides a 20% reduction in the cost of buildings in the city, as well as an increase in army size, and the ability to build 2 buildings in 1 turn. And of course, VIGILANCE is also a good and useful skill!