Tactics for quick battles.

Well, if you calculate everything down to the smallest detail, then it's not Heroes, it's chess! I think a true pro will show their skills in a minute, while someone who's not very good might need 10 minutes! Okay, let's get back to my main question: what's the best tactic for quick battles for Inferno, Stronghold, and Cove, specifically which units should a hero bring along to minimize losses on neutral creatures? And which heroes? I'm very interested in hearing the opinions of experts!