Hit zero and go to the camera view.
So—you see your view as you’d like to render it, right?
If so, and it’s rendering something else, you MIGHT have an issue with hidden layers. Have you hidden any elements? Hit Alt-H to unhide everything.
If this is the problem, do not HIDE these layers as hidden layers are still active render layers. Deactivate them by moving them to their own collection and unchecking the active box in the Collections panel.
This might also have to do with something called “Restricted Render”. In 2.79 there was a shortcut (which I do not know off the top of my head for 2.8). At least in 2.79, it was easy to accidentally restrict certain layers from rendering.
If your whole camera view is different in the render, then something a little more complicated is up.