Auto-translated
Okay. So, first: forget about the Dwarves. It's not the faction you should start with. Try Humans or the Undead. Orcs should also work well, as they represent pure brute force.
Second: ignoring the Forge is still somewhat acceptable... Various ballistae and tents are certainly useful, but you can beat the AI without them. However, ignoring the Tavern is very bad. You absolutely must build it on the first day (if you haven't already) and buy at least one hero. I then transfer their troops to my main hero, while the purchased hero runs around empty, scouts the territory, and picks up whatever is lying around. Of course, experienced players can further refine the tactics of secondary heroes, and this can be very significant, but it's not necessary against the AI. However, having a secondary hero in general is essential.
Third, this might also be worth mentioning. Just in case, I'll add that one simple tactic will significantly reduce losses on neutral creatures: the "Elinich" tactic. Take your first-level unit and separate one creature from it into each new stack. In battle, use them to absorb the attacks so that the enemies don't touch the other, full-fledged stacks. Also, disable retaliatory attacks.
I think that's enough. And then you'll slowly start playing against other players, which will be much more interesting ;)