The vast majority of landscape photos are only half done once the shutter has been pressed; a lot of the image is created in the edit, both from a technical standpoint and in adding your personal style. As such, it is important to be aware of where things can go wrong, and this excellent video tutorial details one of the most common mistakes and what you can do to avoid it.
Coming to you from Nigel Danson, this great video discusses a common mistake photographers make when editing landscape photographs and how to avoid it. I think Danson makes a very important point regarding working with the light and not editing against it or ignoring it entirely. It is possible to make great images in any kind of light, but it takes the ability to read the light and create photos it is conducive to instead of fighting against it and trying to edit a different sort of shot into existence or simply going overboard. Check out the video above for the full rundown from Danson.
And if you really want to dive into landscape photography, check out "Photographing The World 1: Landscape Photography and Post-Processing with Elia Locardi."