The two images above were both taken with the same camera and computer, just under different lighting conditions. Poor lighting will greatly decrease image quality, no matter how good your camera is.
You don't need anything fancy or expensive, you just need control over your lights. You can gain control over your lighting through the physical lights themselves (moving or dimming lights in a room, opening or closing curtains) or through processing on the software side (Zoom or other software settings).
Examples of Image Processing Software:
Settings in Zoom
Settings in the Logitech Software (comes with the purchase of camera)
3 Point Lighting
The easiest lighting setup that results in high-quality images is a 3-point lighting setup that utilizes soft and/or defused light.
#1: Key Light
The key light is the primary source of light. It is typically the brightest and most direct light on the object. It illuminates the object as a primary focus for the audience.
#2: Fill Light
The fill light is typically placed opposite the key light in order to cancel out any shadows created by the key light. Fill lights do not create shadow since they are less powerful than the key light. Fill lights or fill reflectors are used to create the classic "Rembrandt Lighting" technique.
#3: Back Light (also called Hair or Kicker Light)
Back lights are used to create separation between an object and the background. It also ensures the object/subject of the images doesn't appear to be floating in darkness. Backlights are most effective when light from higher than the key or fill lights at set to low intensity. When backlights are placed at an angle, they are referred to as "kickers."
While adding three lights can seem unnecessary, your back light can be something as simple as the room's default room lighting. Typically when rooms are designed, the position of ceiling lights are designed to be soft, all around ambient lighting that closely mimics what backlights are trying to accomplish.
Color Light (additional/optional)
Color lights can add mood and theming to your overall image composition. It can also create direction or emphasis in an image.
Use of Natural Light
Natural lighting is light that comes from the sun. It is arguably one of the best types of lighting to capture human subjects in camera work and why you'll sometimes hear photographers talk about "the golden hour." Natural light provides warmth and glow that is hard to beat with created lighting, especially for the price (free!).
One thing to consider when creating a setup is that the sun will always provide different lighting depending on a variety of factors such as time of day and weather conditions. While taking advantage of natural lighting can result in great images, it can create issues with continuity when filming videos. If you record videos on a regular schedule, it may not be to your advantage to use natural lighting in your set up.