[These] decks with encounters, wonders, mysteries, puzzles, and findings provide a convenient way of creating engaging situations for the players. Instead of rolling for random encounters, pick a card (or draw one at random, or roll a d100 and divide the result by two - whatever sounds like fun for you) and let yourself be inspired.
The cards introduce a variety of encounters and don't dictate the solutions. You're never forced to fight whatever you've found, and the player have a full agency to do whatever they wish. There are no stat blocks and no answers to the mysteries - you're free to take the situation wherever the inspiration takes you.