By adopting the 1...d6 system, you free up 90% of your study time for tactics, endgames, and positional play—the things that actually win games. You will walk to the board knowing your first 8 moves regardless of what White throws at you. You will never again lose on move 12 because you mixed up your Caro-Kann and your French.
So, why play 1...d6 against everything? Here are some benefits: play 1...d6 against everything pdf