I watch them on Blockfolio and after they reach a certain amount (it depends on the coin) I will sell most of them. It't actually a little work to sell them and I'm pretty lazy most of the time, so I just hold most of them. But I can't recommend Blockfolio enough. It's super nice for unlocking your phone every other minute and seeing if something is moving... lol Honestly though it's an easy way to keep an eye on your coins.