Undervalued Areas

[bpc3qh]

Relatively inexperienced in cards (have a lot more experience with comics), and I'm trying to figure out if there are any "market inefficiencies", especially among vintage cards. I'm primarily thinking undervalued players or types of cards. I'm not the kind of collector to chase the 1 of 1 auto/patch cards, for example. I typically only buy the players I like anyway, so if I can save money by buying a less-valued version of one of my guy's RC, for example, the knowledge would be good to have. Appreciate any feedback y'all can provide!