It is always a good idea to try to get your compositions right in camera, both to keep your eye sharp and to retain as much resolution and as flexible a file as possible, but there is no shame in cropping in post, whether to get a different aspect ratio, get closer than you were able to in person, or simply because you have changed your mind about the composition. This helpful video tutorial will show you how cropping can improve your landscape images and different ways to employ it for the best results.
Coming to you from Andrew Marr, this excellent video tutorial will show you how to use cropping to improve your landscape photos. Don't forget as you are working on your cropping that Lightroom offers a range of features to help you dial in exactly what you are looking for. You can set the aspect ratio you want, which is particularly useful if you are planning on making a print. You can also employ a variety of traditional compositional guides beyond just the rule of thirds as overlays. 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."
