Racial ability: "Preparation".

Ah, I often have money;))))

Of course, it all depends on the level you are playing. Money for training during the first 2-3 weeks may be insufficient when playing on Veteran or Hero. Of course, it's good if there are a couple of gold mines or Dragon Utopia nearby.
Otherwise, you can avoid hiring all troops in the town and only take the most useful ones—then you will have more than enough money for training.