For people interested in just testing the waters without actually committing real money to it, you could try out this site: https://coinloop.io/
It's not an exchange, nor a crypto Wallet. It's just a Dashboard where you pick currencies, enter a certain amount, and let it track the value of it over time. This way you could virtually 'buy' certain crypto-currencies that you might have picked if you would have bought them for real, add them to your Dashboard portfolio, and then check every day how you would have done.
It's not the first site to do this, but it's very easy and user friendly. Simple to create an account there and go.