Choose a shutter speed for movement
Camera shake and subject movement are different problems. A faster shutter can reduce both, but moving subjects may need substantially more speed than a still scene. Stabilization can help with hand movement, though it cannot freeze a person walking. Review a test frame and adjust when the subject matters more than keeping ISO low.
Support the camera consistently
Stand with feet balanced, tuck elbows comfortably, and hold the lens securely. Exhale gently as you press the shutter rather than jabbing at it. Use a wall, railing, or tripod when the scene allows and the support is stable. A remote release or timer can reduce vibration for static subjects.
Place focus where the photograph needs it
Choose a focus area that matches your subject and composition. For portraits, decide which eye is most important and check that focus landed there. For a landscape, focus distance and aperture both influence depth of field; focusing at infinity is not automatically correct. Review magnification on the camera when precision matters.
Test the whole chain
Make several frames and inspect them at full size, then change one variable at a time. Check shutter speed, focus mode, lens condition, and stabilization settings. Motion blur can resemble missed focus, so diagnose the cause before replacing equipment. Clean optics with proper materials and follow the lens maker’s guidance.