If you want to practice without getting any real money involve than I would suggest you downloading a portfolio management app like Blockfolio. It is one of those ways where you can practice buying and selling cryptocurrencies without really messing up your capital. Although the gains/losses are not real you will still apply what you have learned. Now if your portfolio is looking good then trading for real might be the next big step for you.
To add to this, there's also a trading simulator that let's you perform many of the traditional actions found in day trading platforms without risking real assets. Here's a link:
https://cryptospaniards.com/simulator/