Yes. We were all like you at the beginning.
But, the drone can fall into the ocean no matter how far it is though the propability is very low. This is something you must be aware of at the first second you begin to fly. Thus the regulations not allow flying over people, roads and buildings, etc. Very minimal chance to happen but it can. Here are people that fly many years and haven't experienced this.
So fly as distant as you can see the drone and take care about the weather and the things you fly over.
And about the sea - if the drone drop into (no matter how far from the coast line) it is crap already because of salt water.
Happy flying.