ENGLISH PILL 91/365: TO HEAR OF / ABOUT / FROM

hear of = to be familiar with someone or something
Have you ever heard of a company called ABC Ltd?

hear about = to find out what has happened to someone
- Have you heard about John?
- No, tell me.
- Unfortunately he has lost his job.

hear from = to receive news, communication from someone
- When was the last time you heard from your daughter?
- Oh, quite a while ago.