Rarely is a landscape photo finished when you take the shot; most such images require some level of editing to create the finished product. If you are new to landscape photography and interested in improving your work, check out this fantastic video tutorial that discusses some of the most common landscape photography editing mistakes and what you can do to avoid or fix them.
Coming to you from Mark Denney, this excellent video tutorial discusses some of the most common editing mistakes landscape photographers make and how to fix them. No doubt, the most common mistake I see newer landscape photographers make when editing their photos is simply overdoing it, particularly when it comes to color. There is a fine line between a photo that pops and one that is gaudy, and it is always better to err on the doing a little less, particularly with things like the saturation slider. If you find yourself struggling a bit with that, make a habit of using the before/after function (backslash key in Lightroom) to keep tabs on how far you are pushing your edit. 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."