In my opinion, this is the main skill of a good Heroes player.
For example, a very large RMG map.
At the beginning, the hero is random, and by day 3, we have: 60-80 gremlins, 30-35 gargoyles, possibly a mage, and perhaps 5 more units, plus the first spell.
Which path should we choose – systematically clear the starting zone until day 5-6, or immediately break into neighboring areas?
And what is needed (army composition, spells, hero level) to capture various treasure troves, meaning the fastest possible development?
The question is quite complex and general, but I think it's very important.
We can discuss specific games (map, sequence of clearing areas).
Important points. We can also post recordings of difficult battles.