Secondary skills in Heroes 3.

Education and Eagle Eye – I agree, they are useless. Navigation too, if the map has no water (usually they don't have water))). Eagle Eye can only be useful in campaigns, if you are playing as a faction with a 3rd-level school against a 5th-level magic user)). Mysticism can be useful if the map is large, there is a lot of mana, and mana wells are rare. This sometimes happens. I don't equip artifacts that increase mana regeneration, because there are always better ones. Scouting is good in online games, but it's better to level it up for a secondary hero and keep him near the main hero. I always take Pathfinding, or almost always, along with Logistics.