Cards that have received a low grade from a TPG (third-party grader) but that still look nice. There was an N167 Ewing posted recently that got hit by the grader because of slight scrapbook gum on the back. I just picked up a 1914 Cracker Jack that graded a poor because of I'm not sure what exactly. There are lots like that out there, in almost every set.
As Leon said, cards with a little damage or glue on blank backs are great buys. Check out the grades on lots of Old Judge N172s and you'll see what I mean; beautiful images with a little glue or writing on the back get clobbered.
But most of all, collect what you enjoy! Get a few cards in hand and you'll see soon enough what bugs you and what doesn't.
Bill
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