One of the trickiest parts of landscape photography is composition, particularly since you cannot control the position of any of the elements in your scene like you can with almost any other genre. A lot of the game is about finding balance between the individual elements, and this fantastic video tutorial discusses some great tips on how you can better achieve that.
Coming to you from Andy Mumford, this excellent video tutorial discusses how to find better balance in the composition of your landscape photos. This is a subtle and tricky thing that often takes years to master, but it is also one of the most crucial to creating a successful shot. One bit of advice that I particularly appreciate is the idea of thinking about composition from a subtractive instead of an additive standpoint. If you constantly ask yourself which things can be removed from the frame, you will often be able to distill the composition down to its strongest representation simply by including only the most essential things. Check out the video above for the full rundown from Mumford.
And if you really want to dive into landscape photography, check out "Photographing The World 1: Landscape Photography and Post-Processing with Elia Locardi."