get a feel for (something)
to become accustomed to something and learn how it works, to learn how to do something
I am beginning to get a feel for my new job.
Landscape mode is almost the opposite of portrait mode as it sets the camera up with a small aperture, here you are trying to cover backgroud scene as much as possible. Its therefore ideal for capturing shots of wide scenes, particularly those with points of interest at different distances from the camera. In this mode your camera must be in stable position to compensate for the small aperture.