Summarize the following:
the cards you plan to purchase. Whenever you plan to buy Yu Gi Oh! cards you need to know all of their traits and stats so you can be sure you purchase authentic cards. Visit the official Yu Gi Oh! website so you can be sure you have accurate information. Go to https://www.yugioh.com/ to find information about the cards you’re looking to buy. Even if you buy your cards from a major retail store or the packaging is sealed, you can’t necessarily trust that they’re authentic. You need confirm the cards are genuine by making sure that the card is correctly named and contains the real stats.  The stats include the attributes as well as the level or rank. Also compare the set numbers listed beneath the lower right corner of the picture of the card to the set numbers of an authentic version of the card. Unopened sets of Yu Gi Oh! cards come in a 9 card single package. Counterfeit cards are often sold in packages containing more than 9 cards or as sets of multiple packs. Sets of 3 packs for discounted prices are dead giveaways that the cards are fake. Whether you plan to buy cards from a person online or in-person, you need to compare the cards they’re selling to authentic versions so you can look for any differences. If the cards that they’re trying to sell you have any differences, then they’re fake. Look up the real version of the card online so you can compare it to the cards being sold.

Summary:
Research Check the name and stats of the cards you buy. Avoid cards sold in sets of multiple packs of cards. Compare 2 of the same cards to spot differences.