All scenarios
Children
Medium
Children move constantly, so shutter speed and continuous focus matter more than anything.
Lenses that suit this: 35mm–85mm. A zoom saves you chasing them around.
The guide
Starting point
1/500s, f/2.8–f/4, Auto ISO.
Focus mode
Continuous autofocus (AI Servo / AF-C) keeps adjusting while they run towards you.
Get low
Shoot at their eye level — it changes the photo more than any setting.