I'm following a tutorial and the creator made the camera into this certain position that I can't seem to follow:
You need to rotate the camera 90 degree along the Y-axis. To do so, select the camera, then hit R then Y then 90.
If going with rotation exactly as in the screenshot then you can just reset rotation of the camera object. Reset location as well to make the camera staying in the center of the scene.
To do this, select camera, press Alt+R for resetting rotation and Alt+G for scale.