Soft natural daylight is best – I face a large window in my office which is where I make most of my videos. The main point is to try not to have your face in the dark.
When natural light is not possible, I recommend an Umbrella Lighting Kit (approx $40) -- that single lighting kit will suffice for home video recording. Here is an example and another example using this lighting kit.
Alternative: a softbox lighting kit.
You do need about 2.5 feet (0.75 meters) of clearance for this lighting kit, placed behind the camera, facing you.
The key is: don't be backlit.