Thought I was good at seeing pins, but apparently after each loss in the analysis I see the very common suggested training for pins. I do lessons a bunch over 211+ on chess.com plus I use other sites too, so I have been self analyzing my games more too. Guess what the dang thing is right, I am in fact not taking advantage of pins and may have won if I did.
What is a pin in chess, well basically when a piece is under attack and protecting another valuable piece. It is pinned in placed because if it moves the more valuable piece will be either taken or possibly if a king it may be a checkmate. Pin study galore here I come, check out this chess.com article on the various types of pin.