A THREAD FOR NEWCOMERS!

Played a random map for the first time. Playing with an ally against 6 opponents. There's a problem: the AI doesn't take some mines with guards. A strong hero doesn't attack a group of gremlins. My ally, with a lot of resources and gold, stopped halfway through building a castle and now only buys troops. He's also not buying heroes; one is sitting in the castle for some reason, and the other is running around the map. Although in other castles, there are strong garrisons without a hero. I've heard about templates; is this the case in all templates? Or are there actually interesting and balanced templates for single-player games against the AI?