None, for Finoha. There is no deposit, no minimum, and no funding step. Your practice portfolio is funded with demo coins the moment you open the app, and the only payment involved is your subscription.
If you are asking about real investing later, the honest answer is that it depends entirely on the broker and the market you choose, and it is not a question Finoha can answer for you. Many brokers now allow very small amounts. Whether that is a sensible place to begin is a question for a licensed professional in your country, not for us.
What we would say: finish the challenge and get comfortable in the simulator first. It costs nothing to be wrong here.