It depends upon which coin you're going for and how much your trust holds in it. It also depends on the duration for which you want to hold and upto what extent are you ready to suffer loss. Let's discuss on the third point. Always remember it doesn't matter how much you trust on a coin or whatever expert advice you had seek, Always Invest money in sufficient amount upto which you are ready to compensate loss. Suppose you invested all your money on a single coin (because you become overconfident on the profits you might get). What if it goes down? Not only you will lose money. You trust on the market will vanish overall. You'll end giving up. So, invest money carefully.