know vs know about vs know of
1 I know Jim=We're friends.
2 I know about Jim=I've heard a lot about him.
3 I know of Jim=I've heard about him once or twice.

Are the above interpretations correct?

Question

know vs know about vs know of
1 I know Jim=We're friends.
2 I know about Jim=I've heard a lot about him.
3 I know of Jim=I've heard about him once or twice.

Are the above interpretations correct?

Answer

1 doesn't necessarily mean "like". It does imply, at least compared to the others, that you know him well enough to have an opinion about him.

2 and 3 mean more or less what you wrote.