I think OP not only a newbiew investor as your question look like don't know how to start trading, you also ask for help which coins is better to invest. If I'm right I think OP don't have any knowledge about cryptocurrency？Remember cryptocurrency is high risk investment as to earn easy money, the opposite of it's also let you loss money quickly. $500 is suitable for start trading, before that please go to coinmarketcap and check the top 100 coins,  recommend choicing by yourself.