茶几 vs. 桌子 (zhuōzi): A common mistake for beginners is to use a specific word for a general category. 茶几 is specifically a low “coffee/tea table.” The general word for any table is
桌子 (zhuōzi). A 桌子 is taller, and you sit at it on a
椅子 (yǐzi) (chair). You sit around a 茶几 on a
沙发 (shāfā) (sofa).