Hello
Great question!
And there is only one answer: "invest as much as much you are ready to lose"
For each person, it can be a different amount. for somebody, it can be 100usd for someone else 10k usd
I have seen that people have asked this kind of thing, and this has been the answer that I have observed that I liked the most. It is true, we must be aware that this amount as we want it twice can be lost, from this it is about