Well, there is no required amount. In my opinion best way is to start with the amount of you are willing to lose.
That is not enough, your capital needs to be big enough so you're not wasting your time when you are trading, I say this because a lot of people have a capital so small that they need to make very big trades compared to the size of their holdings they have and it doesn't matter how good you are, if you do this you are going to lose your money very fast.
I think there is no required amount but, we need to start trading in a verry few amounts of capital. Because from the word new we are maybe on the learning stage and we need to learn .ore things or strategy on it. So I suggest that of we want to trade we need to start in a very small amount to avoid lossing.
As I said that is not enough, people forget that trading has a lot of costs involved, you need to pay a small commission to the exchange, you need to pay for transaction fees, it is unlikely that you are going to buy at the optimal point that you were looking for so you are going to lose some money there as well, and when you add all of those costs you will realize that you need a certain amount of money to become profitable, the amount is not really that big but it exists.