what does opposition in chess mean

It also refers to a concept in endgames where you need to have the opposition with your king. Look it up OP.

Opposition is when there is an odd number of squares between the kings.

https://en.wikipedia.org/wiki/Opposition_(chess)

For a simple practical example, put a white pawn on e4, a white king on d4, and a black king on e7. Try to see what move wins for White.

So far, incomplete word definitions.

A king has The Opposition when it's his opponent's turn to move and there are an odd number of squares between the kings and the kings are on the same rank, file, or diagonal.  The value of The Opposition is that, if his other pieces can NOT move, the king with the move has to move out of the other king's way.

Here is an example. Note how my White King takes The Opposition on the 43rd move and because of the Black King can't move his Pawns without losing them, he has to step out of the way of the White King and allow the White f-Pawn to Queen:

I am very confused by your game MickinMD? First off, 4.d4 in the position isn't the max lange attack.  You also used the term "bad bishop" multiple times(describing your light squred and his dark squared bishop as bad) even though neither of the bishops you described were bad. And yes, while your game showed opposition, a lot of your annotations really confused me.