The most common way to organize Pokemon cards is by set. To identify the set, look for a little symbol at the bottom of the card, next to the card number. There are a bunch of these set symbols… 5-6 sets are released every year, each with a different set symbol, and they’ve been printing cards since 1999!
The following table is a complete list of Pokemon card sets, sorted by date… the newest sets are at the top… the oldest are at the bottom. If I missed something, let me know if the comments! I want this to be THE DEFINITIVE GUIDE FOR POKEMON CARD SETS!