Speaking of protective sleeves, the article https://resellcalendar.com/news/reselling-101/how-to-grade-cards-a-resellers-guide/ recommended using penny sleeves and top loaders. They mentioned how improper storage can lead to damage over time, which could be detrimental to the card’s grade. The guide suggested always washing your hands and handling cards by the edges to avoid fingerprints and oils from your skin, which can affect the surface quality. Also, the section on market trends was quite helpful. Understanding which cards are in demand and their grading histories can guide you in deciding which cards to invest in.