There are a few ideas. You can play b6 and Bb7 or Ba7 or you can go Bd7->Be8->h5. Somtimes you just park it on d7 to defend c6. And lastly you can just destory white on the kingside and never bother using the bishop.
Slav course is great. I am loving the noteboom variation.
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Great Slav course. I am loving the noteboom variation and the lines against the London. Only variations I am having some trouble with is some of the Dutch variations. I find it hard to develop that c8 bishop. Sometimes I find myself playing the whole game not moving that bishop. When you don't take the pawn.