What are the differences between the two catalog unlocking modes?

1. Free Mode: After the course starts, students can study tasks at will.

2. Date Unlock Mode:
 a. Unlock Time: The unlock time for daily learning tasks.
 b. Unlock One Lesson per Day: One learning lesson (one lesson may contain multiple tasks) will be unlocked each day.
 c. Unlock One Task per Day: One learning task will be unlocked each day.

3. Challenge Mode: After the course starts, the next task will be automatically unlocked upon completion of the current task.

Note: For users who purchase the same camp period in the Camps feature, the rules for unlocking lessons or tasks are based on the course dates, not the users' learning progress. For example, if the unlock time for the camp period courses is from May 1st to 7th, customers will start unlocking courses on May 1st for a total of 7 days. If a customer joins on May 5th, they will directly start unlocking the courses for the 5th, and the courses from the 1st to 4th will be automatically unlocked and can be watched directly.