No. Not at all. If you don’t understand a topic, what you do next is completely up to you. You can always ask for a full and prompt refund. And you’ll get your refund right away. Or you can choose to take the class again at no extra charge. In fact, you can take any class that you’ve signed up for as many times as you want.
Use this to brush up on your skills later if you need a review. Or use this to reinforce your learning until you’re confident that you have it mastered. There are no grades at Take Up Code and no evaluations. So you’re the only person who will know if you understand or not.