If the price goes up more, way higher than the price you purchased your bitcoin then obviously you have a profit (minus withdrawal fees if you decided to transfer it to external address). It's fine if you just sit your bitcoin there at the moment (it's an exchange so you are at risk but hey it's the best thing to do right now to save fees) and just make an action after you realized and understand what things you like to do.

Simple holding isn't it? But have possibility to gained profit without touching it. I suggest you to study now what you must need to do so that your coins will not sit on Coinbase for long period of time or if you want to add some more bitcoin, you can save withdrawal fee when you transferred it to external address.