What are the differences between calendar check-ins, assignment check-ins, and challenge check-ins?

中文 1. Calendar Check-in A check-in mode based on a daily unit. Students are required to submit check-in content within the valid time period each day. It is suitable for scenarios of habit formation, such as morning run check-in and early sleep check-in. 2. Assignment Check-in A check-in mode based on assignments. Students need to complete their assignments within the specified time, which is suitable for teaching assessment scenarios. 3. Level-based Check-in A check-in mode based on levels. Students must finish learning the current lesson and complete the check-in to unlock the next lesson. Students can freely arrange their check-in time, which is suitable for scenarios where the check-in time is not fixed.