Basically raising for value to get money in the pot while you probably have the best hand, also min raising is losing value and has no fold equity at the same time so I never min raise, usually fish min raise alot. 3x standard + 1 Big blind for each limper + another big blind if I am playing OOP. ( I do modify this if the stack-pot ratio is going to make me pot committed though or if I am playing against a massive fish who calls big pre-flop raises.)