First, what’s the meaning of prime lens? A prime lens it’s a lens that focal length is fixed, you can’t change this parameter. A zoom lens, you can do it.
And why you use a lens that it’s impossible to change your point of view? Basically because a prime lens normally has more quality that a zoom lens. If you use a zoom lens for example 14-102mm, you get a worse quality than you use a prime lens.
Another question, if you mount a prime on your camera, and you want to capture more details about your subject, you must close to them. In the other hand, if you look for “more” wide, you need to go far away. It’s a good training for your photographic eye this kind of lens.
Normally, prime lenses have a bigger aperture and are very faster to focus.
In the market you can find several prime lenses with different focal lens, for landscape, portraits, etc.
The photo of the post was took with and 25mm Olympus. It’s an amazing lens.
My recommendation, use one. Thanks for reading.