A good composition is a tricky and often elusive thing, particularly since it is not as easily objectively codified as something like the right camera settings for a given scene or situation. As such, any heuristic tricks to go about finding a compelling composition are worth knowing. This excellent video tutorial details one such trick and why it can be really useful.
Coming to you from Mark Denney, this great video tutorial will show you the benefits of turning your camera upside down when composing an image. The idea behind doing this is that your brain will be less able to recognize common objects, leaving you less likely to fixate on them or show bias toward or against them. Once you remove this issue, you will then focus more on the light and shapes in the scene, making it easier to understand and arrange the fundamental structure of the frame and create a compelling image. You can also try it when cropping an image in Lightroom; simply rotate it 180 degrees. Check out the video above for the full rundown from Denney.
And if you really want to dive into landscape photography, check out "Photographing The World 1: Landscape Photography and Post-Processing with Elia Locardi."