These 5 tips are first and foremost thought out when you use a smartphone as a camera.
It’s up to you to adapt them, whether you use a camera or a camcorder.
Switch to airplane mode

Film horizontally

Stabilize your image
Hold the camera with both hands, elbows resting on your ribs: you will gain stability without tiring yourself. For moving videos, you can move slowly: knees bent for better suspension.
Do not zoom
Do not zoom with the smartphone: the digital zooms of smartphones quickly add noise, parasitic pixels to the image. We prefer to bring the smartphone closer to the subject.
Let run 5 more seconds
Cut the recording of your scenes 2sec after the end of these: you will have more margin during the editing to make your transitions.