PSA: For everyone trying to get into Bitcoin right now.
Coinbase is the gas station of cryptocurrency: convenient, expensive. It’s really easy to drop in and grab a water, but if you want to buy a bunch of water, I can’t recommend that you keep dropping by the gas station and paying three dollars apiece for a bottle of water.
Similarly, once you have some basic familiarity with cryptocurrency, you should be using GDAX or Gemini for your buy and sell.
GDAX has the additional benefit of using the same username and password as you used on Coinbase.