chess.com daily puzzle 20211207, Overburdened Defense, black to move, Step 2

 chess.com daily puzzle 20211207, Overburdened Defense, black to move, Step 2

Difficulty level: Step 2

Key concepts: elimination of defence, overloading, double attack

Searching for unprotected pieces (targets) is a basic skill we learn in Step 2. 

My analysis: https://youtu.be/Oa5QIxLWZG8