You didn't give the lesson so I'll give a general overview of the question.
- First and foremost, you've to know what the lesson entails. The lesson is the teaching, so you've to understand the lesson.
- Then, the most difficult part of the lesson will be the challenges that you faced during the lesson. For example, if the lesson is about a passage that you read, the difficulties encountered may be the vocabularies, etc.
- So, after you've got a thorough understanding of the lesson, you can understand the most difficult parts which are the challenges that you faced during the lesson.
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