1 Your camera may not be able to record detail in both a bright sky and a darker landscape in a single exposure, so consider using a neutral density graduated filter (ND grad) to balance the two. (See page 42 for more on this)
2 Avoid placing the horizon through the middle of the picture, unless you’re shooting a reflection. Try framing the scene so that more space is given to the sky or the land, depending on which is most impressive.
3 Wide-angle lenses and landscapes go hand-in-hand, but don’t ignore longer lenses. Longer focal lengths are useful for isolating details and for compressing parts of a scene so that they appear closer together (an effective technique for creative shots of rolling hills).