It depends on how much amount you can afford to lose because trading is highly risky and there are always 60-70% chances of loss. High capital will give you high profit in less time and vice versa but you should start will less amount just to know a bit about the crypto world. So 100-300$ is enough to start a trade.
Yes thats enough for me to start in trading but now the chances of winning in trading is lossing me enough for trading now because some coins that not profitable anymore.