Not to be too clickbaity, but I think this list will surprise you
These insights help you see the bigger picture, identify potential investment opportunities, and understand the "why" behind a card's price, not just the "what." Common Price-Checking Mistakes to Avoid Getting an accurate price for your Pokmon cards is a skill, and like any skill, it takes a bit of practice to get right
Research sold listings on eBay and TCGPlayer before deciding how to grade Pokmon cards
This assumes a response time of 1 business day or less for proofing and changes
Thus, when you are prevented from playing items by something like Vileplume, you often get stuck with a large number of useless cards in hand
This test can be brought to a very sophisticate level using an external flash connected to a camera in an artisanal black box