When doing 1688 self-service promotion, you can use the following methods to select keywords:

1. First, determine the main features and selling points of the product or service you want to promote, such as brand, model, function, discount, etc.

2. Then, based on these features and selling points, try to enter relevant keywords in the 1688 search bar. This can help you understand which keywords your competitors are promoting and which keywords have a high effective click-through rate.

3. When selecting keywords, choose keywords that are highly relevant to your products or services and avoid keywords that are too general. For example, if you are promoting furniture products, choosing the word "furniture" is obviously too general and may attract some irrelevant clicks, while choosing more specific words such as "solid wood furniture" and "Nordic furniture" can more accurately attract the attention of potential customers.

4. You can use the keyword recommendation tool provided by 1688 to find relevant long-tail keywords, which may be closer to consumer needs.

5. Finally, when choosing keywords, pay attention to your target customers and choose keywords that are suitable for them. For example, if your target customers are B-side customers, it may be more effective to select some professional industry terms and keywords.

I hope these methods can help you select suitable keywords for 1688 self-service promotion.