Which webcam should I buy

Hello everyone Im going to start using sites like UserTesting, DScout, TryMyUI etc and I need a webcam....I plan on buying a 20 dollar one on Amazon...is that a good enough webcam or do I have to buy a more expensive one...can anyone help me know which features the webcam needs for these sites like a microphone etc any other cords I have to hook up to it etc Thank you!