Doudian's (Douyin e-commerce) hot-selling bidding registration is a way for merchants to participate in bidding promotion activities on the Douyin platform, aiming to increase the exposure and sales of products through paid promotion.

Here are some tips for participating in Doudian's hot-selling bidding registration:

1. **Understand the rules**: First, read the rules and requirements of the Douyin platform for hot-selling bidding registration in detail, and understand the registration conditions, fees, bidding mechanism, time limit and other information.

2. **Product selection strategy**: Select products with potential for promotion. Analyze factors such as product characteristics, market demand, and degree of competition, and select products that are expected to become hot-selling products.

3. **Keyword research**: Study the search habits and keyword usage of target consumers, select appropriate keywords for bidding, and ensure more accurate advertising.

4. **Bidding strategy**: Set bids reasonably, ensuring that advertising costs are within a controllable range and maximizing advertising exposure. You can find the best balance by experimenting with different bidding strategies.

5. **Creative optimization**: Create high-quality advertising creatives, including pictures, videos, titles, and descriptions, to increase the attractiveness and conversion rate of the ads.

6. **Time period selection**: Analyze the active time of target consumers and choose to run ads during peak traffic hours to improve advertising effectiveness.

7. **Data analysis**: Continuously monitor the effectiveness of advertising, use the data analysis tools provided by Douyin to understand key indicators such as the click-through rate, conversion rate, ROI, and adjust the bidding strategy based on the data.

8. **Budget control**: Set a reasonable daily budget to ensure that advertising costs are within a controllable range and avoid excessive consumption.

9. **Continuous optimization**: Continuously optimize keywords, bids, creatives, etc. based on advertising results to improve the effectiveness of advertising.

10. **Comply with the rules**: Comply with the advertising policies and regulations of the Douyin platform to ensure that the advertising content is legal and compliant and avoid penalties for violations.

Please note that the above information is for reference only. Specific operating skills and strategies should be adjusted according to the latest rules and market changes of the Douyin platform. At the same time, it is recommended that merchants consult the official customer service or professional institutions of the Douyin platform before actual operation to obtain the most accurate information and guidance.