I my advice is don't watch a lot of videos and relay completely on the them coz many of them are just trying to hype some coins to make some profits,
and yes you can play with them and make some money but it's a dangerous play
What do you mean to play money? Are you thinking gambling? In my opinion the best think to do is to make an investment to different sites like trading, because in that site you can and sell coins or altcoins to increase your income. You can easily determine the fluctuation of coins and altcoins to the market.