Struggling with the Caro-Kann at the 33rd Chicago Open

I was extremely concerned this game because I have serious troubles figuring out the proper path forward in a Caro Kann advanced. My opponent startled me with an interesting move that left the position balanced around the move 20 point.
He shouldn’t be able to do that at 1947 but he did and I need to make certain he doesn’t do it again . 😤