Shooting from different vantage points provides an interesting and fresh perspective to your photos. This is not just limited to landscape photography. Portraits, fashion, photojournalism, and wildlife photographs can benefit from a different perspective. If you're looking to create a certain mood or atmosphere in the photo, you should decide carefully whether to shoot from a low angle or a high angle. The effects of a low angle shot empowers the subject, and a high angle adds a sense of vulnerability. For example, when Superman is on a ledge - he's often shown from a low angle perspective to emphasise his power.
Here are some examples of different vantage points.
Let me know in the comments below what techniques you would like me to explore next.