Small, but sometimes important, tactical tricks.

I love it when an enemy hero attacks, and I can place several weak heroes in front of my castle so that he spends his mana on them. Also, at the beginning of the game, I always spend a few weeks buying heroes of my faction in the tavern and taking their troops: as a rule, when I need to capture mines, these weaklings are very helpful. And the console in Heroes 5 is the most perfect guild of thieves; it works for any price, and I use that too.