I recently bought a Nikon 50mm f/1.8 lens as it was recommended as a good lens to have in my kit and to help in learning more about aperture, depth of field and exposure.
Having always had a zoom lens, it was rather a change to have to actually MOVE to change the composition of a shot rather than just twist the lens.Focus is still automatic if I want it to be.
Depth of field creates particularly interesting opportunity to create unusual shots from everyday objects..having a remote control in focus and everything else blurred compared to a rather more conventional shot completely changed the impact. I am now getting a better understanding of how the camera works and look forward to experimenting more.
My next lens will hopefully be a Nikon AF-S VR 70-300 f/4.5-5.6G IF-ED which will allow me to take better transport-themed shots when out and about.