These exercises give you a chance to practice the concepts presented in the lessons. Do the ones that appeal to you, and take them at your own pace. You don't have to do any exercises before continuing with the lessons. They are completely optional. The later exercises do build on earlier lessons, so it's best not to skip ahead.
For some exercises, I give examples of possible responses. The sentence "You can check my suggestions, if you wish" lets you know when this is the case. My suggestions are not answers. They are simply examples of the kinds of insights you can get from the cards. In the tarot, whatever your intuition tells you is valid. Everyone sees the world through a different lens. Your goal is to learn how your own particular lens works.