Coinbase is one of the first en safest cryptocurrency in the space. When you start buying and storing cryptocurrency this is the best place to start.
Coinbase has also a free crypto-earn-program. When you join you can earn up to $158 dollar free cryprocurrencies:
There are also other good exchanges like Huobi, Binance, Uphold and Hotbit. Try Coinbase first before you try the others.