Archive of Nethys(AoN) is the official PF1 online rules source SO link and refer to that as Rules As Written(RAW). Other websites can be handy for searching and third party content but they can also make unapproved edits which aren't disclosed which can make rules lawyering complicated.
I have a question about the black pudding monster, when the monster deals acid damage to a weapon it bypass the hardness, or we need to substract the hardness before que apply the damage to the weapon?