One hand pistol shooting....
Learning to shoot well with either hand is a good thing......you never know when you may need to shoot WHO (weak hand only)!
Shooting with one hand was taught by the Army in the days when they still had horses used in the cavalry.....a soldier might have to hold the reins of their horse while shooting a pistol. This eventually led to one hand target shooting in NRA competitive Bullseye matches, which is a great test of mental focus, discipline, and accurate handguns and ammo.
However, for self defense, the modern two hand hold is best to effectively control the recoil for fast follow up shooting with powerful self defense loads, which may be required when using handguns that don't stop a threat. The two thumbs forward "modern" grip is taught in most all self defense training classes.