Beyond the square-range stance
Pistol Fundamentals built your standing platform; real application adds lower positions, movement, and cover. These are the pistol versions of the field-craft and carbine-fighting skills, scaled to a handgun, and they're trained slowly and dry first because adding movement and positions multiplies the safety stakes.
Positions
You won't always have a clean standing shot. **Kneeling** (drop a knee) gets you lower — behind low cover, or for a steadier shot — and is the most common alternative position. **Compressed/close-contact positions** bring the pistol in tight to your body (a high, compressed ready or a close-contact firing position) for very close range, retention, or working in confined space where a full extension would push the gun out where it could be grabbed. **Squatting or sitting** may be forced by cover or terrain. In every case the fundamentals carry over — grip, sight tracking, trigger — adapted to the position, and the position is usually dictated by the cover and what you must see around, not by preference.
Moving with the pistol
Moving while armed is a defensive reality and a safety-critical skill. The absolutes, identical to the carbine: **muzzle discipline** — the muzzle stays in a safe direction (a controlled muzzle-down/compressed ready) as you move, never sweeping your own body, legs, or others; and **trigger discipline** — the finger is straight and OFF the trigger, indexed, *any* time you're moving and not in the act of firing a justified shot (the overwhelming cause of negligent discharges is a finger on the trigger during movement and gun-handling). Move with bent knees and smooth, balanced footwork that keeps your upper body stable, the pistol at a ready, eyes up. And the honest truth from the carbine track applies even more to the harder-to-stabilize pistol: **shooting accurately on the move is hard — usually the answer is to move OR shoot, not both.** Move to where you need to be and shoot from a brief stable stop, or pause for the shot; genuine shooting-on-the-move is a close-range, slow-pace, advanced skill, not the default.
Using cover
**Cover stops bullets; concealment only hides you** (the distinction from the carbine/sniper tracks). Use cover for both protection and as a brace, and apply the key principle: **don't crowd your cover.** Backing off a step from a barricade or wall gives a wider field of view and fire with *less* of your body exposed, keeps your muzzle from protruding past the edge (where it gives you away or can be grabbed at close range), and protects you from rounds skipping along the cover's surface. Expose only what you must, only when you must; shoot around the side of cover in preference to over the top; don't linger exposed; and vary where you appear rather than popping up from the same spot. As with the carbine, you can shoot from your support side to use cover on that side without leaning your body out into the open — awkward and looser, so trained deliberately, but it keeps you protected. All of this is governed by the safety rules first: positions, movement, and cover only make sense on top of absolute muzzle and trigger discipline.