The minimum amount is relative. You can start trading with any amount you can afford to lose. Just start trading with any amount that you can afford to let go
There is no minimum limit for trading, but if it's too little quickly runs out. As a beginner, you will experience many losses, which are natural. But don't give up, keep learning and continue trading until you find the right method for yourself. Don't use someone else's method, because it is not sure to suit us.
If you just begin trading, do not invest too much money in the cryptocurrencies. You need to learn how to do it. For instance, start with 100 dollars. Even if you lose it, it will be not a great loss but a lesson for you.