There is distinctions to be made as to the kinds of knowledge out there:
1) Knowledge where
2) Knowledge how
3) Knowledge who
4) Knowledge of
5) Knowledge that ~~> i.e. propositional knowledge
I got these from Marianne Talbot, who teaches Philosophy at Oxford U. The link for this is here.
~ She states that there are views that state that (1)-(4) can be subsumed into (5).