Being outdoors you can really appreciate all that nature has to offer, and if you find yourself in the right place at the right time you can create some stunning photographs. The best landscape photographers have to be incredibly patient, know a place well enough to judge the lighting and how it looks at different times of the day, and find the perfect angle to really capture the essence of the scene in front of them.
These things come from experience and can take time, lots of time, to get right. To some extend these are also elements you may not have much control over. What you can control is what your artistic vision may be. What you are trying to portray in your image. Are you wanting to capture a wide sweeping landscape or single out a particular part of it? For most people it seems to be the former, as all the different elements in the scene come together and add context to eachother.
If you want a wide field of view, you will need a wide lens. There are numerous lenses around the 24mm range, including a number of zooms and specific prime lenses as well. for my landscape and general wide angle shots, I tend to use my 16-35mm lens. Although my version has a fairly modest aperture of f/4, this is often perfectly adequate for use outdoors where there is usually ample ambient light for this to not matter, and I can still maintain a high enough shutter speed to not need a tripod - this is useful when I want to be mobile and change position often.
What you need to decide now is whether you want there to be more of an emphasis on a foreground element, or have most if not all of the entire scene in focus. If you want to emphasise the foreground, use a wider aperture. If you want the whole scene in focus, use a narrow aperture. This will of course mean you are letting in less ambient light, so a tripod may come in handy now.
The thing with wide angle lenses is they can create some odd perspectives, especially with parts of the scene at the edges of the frame, or close to the camera. They will often appear much bigger than in reality, or will be slanted. As there are very few straight lines in nature, this is often not an issue as you won't feel a line that is meant to be straight is now slightly warped. However this can become an issue when you place man-made structures in the scene - so try and keep these away from the edges where this warping effect is more prominent.
So wide angle is usually the way to go for landscapes. Something ranging from 16mm or so, maybe up to 35mm for something a little more focused. Again you can choose a wide zoom or a prime depending on your preference, but be prepared to move to change your field of view if you choose a prime. Landscapes gives you a huge range of different compositions if you look for them. Make use of the rule of thirds, leading lines, subtle framing features eg branches of trees. If you are looking for more of a focus on a part of the landscape and you can't realistically get close to it, having a medium telephoto lens is also a good accompaniment to something wider. Perhaps a 24-70mm or equivalent will give you a bit more flexibility.
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