What I think are
Queen's gambit accepted
It is a completely fine opening which many beginners may consider as a mistake. I prefer to accept queen's gambit with the c5 system, that's my favorite.
Knight attack
Italian game: Two knights defense, Knight attack is often perceived as active and attacking opening but actually what ends up happening is what is completely passive for being up a pawn. In fact, white must be very accurate to not have lost position.
By misinterpreted I mean their actual nature not actually being how many beginners perceive it