Lighting is key, you can have some awesome equipment to film people, but if you do not utilise light correctly, you can have a mediocre looking shot. Three-Point Lighting is the basic lighting setup to use when you want to get great looking shots of people you're filming.
Three Light Sources:
A fourth lighting source can be for the background. The following tutorial will give a run down of these 4 light sources.
Various lighting styles
How a ring light can provide a unique look
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