How should I play the caro kann exchange variation (as black)

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I heard that it's best to launch a minority attack on the queenside, but white usually stops it, what's the correct way to do it?
It's difficult to trade of the a pawn and white will be able to stop the a pawn from pushing, allowing them to remain a connected pawn structure in the c and d files/

tygxc

Here is a Fischer game
https://www.chessgames.com/perl/chessgame?gid=1044326 
A recurring thema are the good bishops Bf1, Bf8 not on the color of their own pawns d4, d5 and the bad bishops Bc1, Bc8 on the color of their own pawns d4, d5.