In its 22 September update, OpenAI describes flashcards in ChatGPT. They can be used on mobile and the web, and saved in the library to return to later.
Then try answering yourself before turning the card over. Mark what you knew and what you need to revisit. That makes revision more active than simply reading the same summary again.
It could be vocabulary, bird names or concepts from a course. Keep the first set small enough that you actually use it. A few thoughtful minutes with six good questions can be a pleasant start to a new habit.