Here is a confusing question waiting for you to answer.
Do you know __________ to fix a computer?
(A) how (B) where (C) what
The answer, I think, should be (A). But could (B) be the answer to the question?
Do you know how you can fix a computer?
--> Do you know how to fix a computer?
Do you know where you can fix a computer?
--> Do you know where to fix a computer?
I know (C) is inappropriate because the verb "fix" cannot have the object "what" as well as another object "computer".
Thanks a lot for your explanation!