how do I curve a mesh??

Hi everyone,
I’m new to blender and need some help with something that’s (probably) basic. How do you curve a mesh? before i’ve just moved the verticies around until it looks curvedish but this doesn’t seem very accurate or effective. I’m making a rocket to practice on but the nose cone has proved difficult, especially since the curve is exponetial.
any help would be appreciated.

this is probably what you need

thanks, that helped heaps