If you are just starting out trading or want to start. I suggest that you place $50 in your wallet so that you can start trading. Get a feel for the market. Learn those patterns and how to detect them before hand. And $50 is just the right amount so that you still have that flexibility in the market. But don't be discouraged if you liquidated it. At least you've gain experience and that's maybe the most important attribute you need in trading, hell, In anything you want to do.
Don't try future's trading where you can get liquidated. A new person should always start with the spot trading. If you made few bad trades in the beginning, you will not get liquated. 50 -100$ is the right amount to start trading. If you are lucky enough, you can convert those 100$ to 1000$ or more.