If you really want to sound like you know your stuff, you need to understand the difference between subject pronouns and object pronouns. I, you, he, she, it, we and they are subject pronouns.

But we tend to run into problems with object constructions. We get so conditioned to say "you and I" that we want to use it everywhere, as in: "Just between you and I, his feet smell terrible." ...

Ever since the first time we got scolded for saying “Bobby and me were riding our bikes,” most of us have understood that pronouns are serious business. The swift correction we got made that ...

They are known as subject and object pronouns. It is oftentimes a big deal for some people to tell when to use ‘who’ and when to use ‘whom’. The difference is quite easy to know.