Of course, the "where" questions are very simple and you've heard them before.

当然，“where”问句非常简单，你之前肯定听说过这个用法。

Where 课堂 - SpeakingMax英语口语达人

and undoubtedly you have heard and used "who" questions many times before.

毫无疑问，你肯定已经听过并且使用过“who”问句很多回了。

Who 课堂 - SpeakingMax英语口语达人