Easy question, I need responses when - you know and don't know an answer?

I just I need as many responses as you can think of for when

1. you know an answer
ex : I knew that, that is correct, that is true,correct

2. you don't know answer -
ex: I'm not sure, I have no idea, not sure, I'm clueless

3. just learned an answer
ex: I did not know that, that's interesting, that's cool

Any contribution is greatly appreciated, thanks in advance.

1. of course, absolutely, yes
2. you learn something new everyday, imagine that
3. thank you that was fascinating, wow, i'll keep that in mind, good to know