For each faction, there is a rather vague set of standard skills, which, in principle, doesn't exist as such, so everyone decides for themselves what exactly should be chosen. The selection of such skills can simply be dictated by the player's own preferences, the chosen tactics for waging war, the size of the map, the strength of the opponent, the artifacts found, the speed and method of development, the characteristics of the faction and its heroes, and finally, just randomness (once, while playing as demons, I had to choose between Navigation and Scouting). There are war heroes, magic heroes, and balanced heroes. Therefore, for me, it is preferable for powerful wizards to take various schools of magic, Spell Power, and Education, while for warriors, the set includes Attack, Defense, and whatever will be