Light is crucial in any form of photography, but unlike most other genres, you do not get control of it in landscape work. Thus, it is crucial to be able to read the scene you are presented with to create photos that the light is conducive to, rather than fighting against it. This fantastic video tutorial will show you the different kinds of light you will encounter and how to use them to create the best possible photos.
Coming to you from Andrew Marr, this excellent video tutorial discusses the various sorts of light you will encounter in landscape photography and how to use them to your advantage. It is a common mistake in landscape photography to work against the light in an attempt to create a preconceived image, and while it is certainly a good thing to plan ahead, if nature is not giving you what you want, being willing to adapt on the fly will benefit your work. Good images can be made in any light, as long as you are making photos it is conducive to rather than fighting it. Check out the video above for the full rundown from Marr.
And if you really want to dive into landscape photography, check out "Photographing The World 1: Landscape Photography and Post-Processing with Elia Locardi."