I store my bitcoins in a wallet, it is coins.ph and there I store up my earned bitcoins. When I don't need to cash out money, I just keep my bitcoins there. It is safe and reliable to use, and also, easy to understand how to use it. For now, I haven't verified my account so I can't cash out my bitcoins.
Same with me. I just keep Bitcoin in my wallet with a purpose that Bitcoin will bring to me more income in the future. Sometimes I change Bitcoin into cash and send it to bank. However, I recommend you guys should keep your Bitcoin in your wallet on the internet.