When to retry
Replay a lesson if your Real Accuracy was low, you made many corrections, or you want more stars. Repetition is how typing becomes automatic, so retrying a weak lesson is time well spent.
When to move on
Continue to the next lesson once you can type the text smoothly with few first-try mistakes. The curriculum is sequenced so each lesson prepares you for the next, as explained in how lessons work.
Track your improvement
Either way, your results are saved. Compare attempts over time in your tracked progress and aim to raise your star rating on lessons you replay.