Massive Classroom is an educational live broadcast section on the Douyin platform, which aims to provide users with knowledge and skills training in various disciplines. When selecting products on Massive Classroom, you can follow the following principles:

1. Understand user needs: First, you need to study the target user group, understand their age, interests, learning needs, etc., so as to provide them with suitable courses.

2. Choose popular fields: According to market research and industry trends, choose popular subjects and fields such as programming, design, photography, short video production, etc. These fields have high user demand and commercial value.

3. Pay attention to the faculty: When selecting products, you should pay attention to the faculty and ensure the quality of the course. Invite industry experts, well-known scholars and experienced practitioners to serve as lecturers to increase the attractiveness of the course.

4. Highlight the characteristics of the course: The course content should be unique and innovative, different from other competitors. Differentiation design can be carried out from the aspects of curriculum system, teaching methods, practical links, etc.

5. Consider the course duration and difficulty: According to the user's learning habits and ability level, the course duration and difficulty can be reasonably set. You can choose to provide courses at different levels to meet the needs of students of different levels.

6. Set a reasonable pricing strategy: According to the course content and market demand, formulate a reasonable pricing strategy. You can provide preferential activities, trial courses, etc. to attract users to buy.

7. Course publicity and promotion: Use the promotion tools of the Douyin platform, such as short videos, live broadcasts, community operations, etc., to widely publicize the course and increase the popularity and influence of the course.

8. Collect user feedback: After the course is launched, actively collect user feedback to understand user satisfaction and suggestions. Based on this, continue to optimize the course content and improve the quality of the course.

9. Pay attention to industry trends: Always pay attention to the development of the education industry and the Douyin platform, and adjust the course strategy in time to adapt to market changes.

Selecting products through the above principles can improve the course quality and market competitiveness of the huge classroom and provide users with satisfactory education and training services. At the same time, we must continue to pay attention to user needs and market changes, constantly adjust and optimize course content, and achieve sustainable development.