Psychagogy is not a commonly used word, but it is likely a misspelling of "psychology."
Psychology is the study of how our brains and emotions work. It helps us understand why people think, feel, and act the way they do.
Just like how you learn about how your body works in science class, you can learn about how your thoughts and feelings work in psychology class.
Psychologists use different methods to study the brain and emotions. Sometimes they might talk to people to learn about their feelings, and other times they might use special equipment to see what the brain is doing.
By understanding how our brains and emotions work, we can learn how to manage our feelings and make better choices. It can also help us understand why other people do certain things and how to communicate with them better.