Take first of all the lone bishop. It can only cover 32 of the squares of the board and can be dominated sometimes by a lone knight sitting on its opposite colour unchallenged. Its weaknesses therefore would be the half of the board it cannot touch. Frequently I have played against a bishop and stuck everything on the opposite colour squares. Without targets it is hard to find play. When you have two bishops, on opposite colours, on the same side, your play cooperates - hide there, Bishop A gets you; hide there instead and Bishop B gets you. There is another old saying "One bishop is worth half a bishop; Two bishops are worth three bishops." This illustrates how the cooperating firepower can dominate the board.
About bishops working together
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Hey, I have a rather low rating, so I was reading under study plans for people with my rating (actually from the begining because I didn't want to miss anything) and it said that bishops work well together because they cover up each other's weaknesess. I have no idea what that means. Can someone with a much higher rating tell me what they mean? Or anybody that knows what that means. I need a "for instance." I could use the help......