False Friend: “Hair” vs. 头发 (tóufa): A common mistake for beginners is to use
毛 to talk about the hair on their head. While not technically wrong, it's unnatural. For head hair, you must use
头发 (tóufa). Saying “我的毛很长” (Wǒ de máo hěn cháng) sounds like you're talking about your body hair, which can be awkward.