Opening Knight/Rook Exchange

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ThePhilthy88
Hi, I haven't studied chess much, just enjoy playing and I would love if someone could please explain something to me. Why is it every time during the opening few moves, when I take my knight out to play Knight to F3, my opponent immediately forces an exchange with their Bishop? Like EVERY TIME? Would just love to know what I'm missing here 😅
mjeman

It's a pin.

https://www.google.com/search?q=early+knight+pin

https://chess-teacher.com/pin-on-your-knight/