Location
Find a location with little background noise. Avoid areas with lots of echoes.
...
Avoid having your light source in back you to eliminate being backlit.
Camera setup
Whether you are using a mobile device, desktop/laptop computer with a webcam, or any type of camera, make sure to check your camera settings and you are capturing one of the following formats: 720p or 1080p.
...
Stand/sit up straight, avoid seats with wheels/swivels, overstuffed cushions, or are squeaky screws.
Avoid clothing with colors that blend in with your background, accessories that make noise.
...