Grammar question: heard of or about

" heard of" refers to general events or things whereas " heard about" is more specific .e.g: I heard about the fight last night.

These are phrasal verbs. "Heard of" shows you know the existence or name of the bar, while "heard about" shows that you know some more information of the bar.

Heard of → recognition

Heard about → detailed information

Both would be suitable and it depends on what you want to communicate! To hear of something is used to communicate being aware of its existence whereas to hear about something refers to learning specific details of that something.

1. "of" would indicate you did not know about its existence

2. "about" would be more about its characteristics as a bar . . . You may know it exists but have never been there or been told anything about it. So let's change the sentences a little: I don't know (anything) about that bar. I don't know of that bar (first time of hearing).

Both are correct, but they have slightly different nuances:

“I haven’t heard of that bar” = You don’t know it exists. (Most common)

“I haven’t heard about that bar” = You didn’t hear any news or details about it.

If you mean you simply don’t know the bar, use “heard of.”

'I haven't heard of that bar' is correct. The second option doesn't work because it would mean that you haven't heard 'something' about that bar instead of simply of its existence which is what you wish to say.

Both “heard of” and “heard about” are correct but they don’t mean the same thing.

“I haven’t heard of that bar”

→ You don’t know it exists.

“I haven’t heard about that bar”

→ You know it exists, but you don’t know any information or news about it.

So, if the bar is new to you, say: “I haven’t heard of that bar.”

If you know the bar, but not the news or story, say: “I haven’t heard about that bar.”

You use "hear of" to let people know that you know a bit about it but not a whole lot. You use "about" to let people know that you know a lot about it.

In your case, if you say "I haven't heard of that bar", it just means you don't know anything about that place, even just a little bit. If you say "I haven't heard about that bar", it means you know a little bit about that place and you know that place exists, but you don't have any details or know a lot about it.

When you use "about" you should be mentioning something related to that bar, such as an incident happened there, someone visited etc. But if you use "of that" you're directly talking about the bar itself.

E.g Have you heard of the bar in the center? There is a bar and I'm asking for confirmation if you know it or not.

Have you heard about the bar in the center? We both probably know about the bar and there are some news about that bar.