“What should I buy?” is the most common question in Pokémon collecting, and the honest answer is that it depends on why you are collecting. There are three broad approaches, and they behave very differently.

Sealed product

Buying boxes and leaving them sealed is the simplest approach. The appeal is that supply shrinks over time as other people open theirs. The drawback is storage: sealed product takes space, and it needs to stay dry, cool and out of the sun to stay in collectible condition. Dented corners on a box matter to buyers.

Modern chase cards

Illustration rares and full arts from current sets are easy to buy, easy to sell, and driven mostly by artwork. This is the friendliest route for a new collector, because you can buy exactly the cards you like, one at a time, without opening anything. Prices move, sometimes sharply, when a set is reprinted or a card sees competitive play.

Vintage

Older cards carry the strongest nostalgia and the highest risk. Condition is everything, fakes exist, and the gap in price between a lightly played card and a graded gem is enormous. If you go this way, buy from sellers who show clear photographs of corners, edges and surface, and learn what a real card looks and feels like before spending real money.

A few rules that apply to all three

Sleeve anything you care about immediately. Keep a simple list of what you own and what you paid. Avoid buying at the peak of hype around a new release, when supply is lowest. And treat collecting as something you enjoy rather than an investment plan: the cards that give the most pleasure are usually the ones you chose because you liked them.