The modern technique of shooting the handgun relies on using both hands, but the ability to shoot well with a single hand only, and certainly either hand only, is a fundamental skill of the accomplished handgunner.
Many shooters change their stance when shooting with a single hand, generally putting the firing-side leg forward of the other, and assuming a somewhat bladed posture. I am apposed to this technique because I don’t find assuming such a dedicated stance in a fight realistic.
Rather, my suggested technique is to rely on the same stance and body mechanics that we use for our default two handed shooting, using the same bent elbow and curved wrist, but I find a slight cant of the gun helps control recoil when shooting single-handed.
See the video: