There are roughly 2 ways to trade bitcoin:

1. Trade bitcoin for altcoins and then back to bitcoins: This is one of the best ways to trade bitcoins as it can yield you with the highest profit margin. Trade in other cryptcorrencies such as Ethereum and many more, and then sell back to bitcoin when you want.

2. Trade for Cash: This is another great way to trade bitcoins and is generally less riskier than trading to altcoins. You can buy and sell bitcoins for cash or wired transfers on websites such as Localbitcoins.com. This is one of my favourite sites to cash out on my bitcoins as it is reputable and fast. Paypal can be risky if the seller is unknown as they can easily refund their purchase, while you cannot refund your bitcoins.