Shooting video
Avoid pointing the camera toward the light. Your subject will be a silhouette. Beware contrasts.
Hold the camera steady! Use a tripod, lean against a wall, or try the shoestring method.
Leave space to edit. Before you begin and after you have finished asking questions, let the camera run 10 or so seconds.
Find a break in the action/talk. When editing, don't cutthe video when someone is still talking or just as they finish.
Adjust the sound in the editing program so that it is at a consistent level.
Pay attention to sound. Avoid recording in rooms where there is a lot of noise, machines humming, etc.
Know what questions you want to get answered before you begin taping.