What are the types of contents available as learning materials?

The contents of learning materials are categorized into four types:

1. “Study” card
2. “Quiz” card
3. "Report" card
4. "Survey" card

As subcategories, the “Quiz” cards are categorized into four types:

1. “Choice type” card
2. “Fill blank input” card
3. “Fill blank choice” card
4. “Re-order” card

The “Survey” cards are categorized into two types:

1. “Choice type” card
2. “Free report” card