What are the best camera settings for taking group photos indoors?

Indoor light is often dim and mixed, so start with aperture priority mode. Choose an aperture around f/4 to f/5.6 to keep everyone in focus while letting in enough light. Set your shutter speed to at least 1/125 to avoid blur from hand movement. Then raise the ISO until the exposure looks right; modern cameras handle higher ISO well. Switch white balance to tungsten if you are under warm bulbs, or use auto and adjust later. If you have a flash, bounce it off the ceiling or a wall rather than pointing it straight at faces. That softens shadows and avoids red eye. Ask everyone to stand still for a moment after the shutter clicks, because indoor shutters can be slower. Check the screen after each shot and zoom in on faces. If the room has windows, use them as your main light source and position the group facing the light. Avoid mixing daylight and artificial light in the same frame, as it creates odd colour casts. With practice, you will get crisp, natural shots without needing extra gear.