It had been drilled into her by the trio in the Dimensional Space of the various things at stake. All three of them were unique existences with a plethora of experiences.
And since Stencil was smart, to begin with, she came up to speed soon after. Following that, she trained and got used to all her abilities. It was especially since there was no lack of Mental Energy, considering a consistent stream continued to gush into the Dimensional Space nonstop, with it only increasing in quantity over time.
Manipulating humans, the acting Skills possessed by Compass Carburettor—inherited by Dota through Secret Society, the business acumen that he possessed, trickery, life skills that consisted of a variety of daily chores, general knowledge, etc.
Stencil trained in everything. Moreover, Gana taught her everything related to combat, beating all sense into her until it became her instinct.