1. Make good use of hyphens (-) to reduce unnecessary repeated words. Adding hyphens to keywords can include all keyword combinations and individual words. For example, for a keyword like "anti-aging", valid words include "anti", "aging", "anti-aging", "anti aging", and "antiaging".

2. Don't worry about whether the word is singular or plural. As long as you type one of the forms, the system search will automatically include the results of the singular and plural forms. So you don't need to fill in both the singular and plural forms of keywords. Just choose one.

3. There is no difference between uppercase and lowercase, so it is meaningless to fill in the uppercase and lowercase forms of the same word.

4. When the Amazon search engine is running, it will automatically omit filler words and stop words, so don't fill in these words in the keywords, which is equivalent to wasting space!

5. Never use exclamation points! If you use exclamation points, the search term must have an exclamation point, which means that the keyword must be exactly the same as your keyword with an exclamation point in order to be found. In order to increase the chances of being searched, exclamation points must be avoided!