Short answer
Use plain product text of no more than 5,000 characters. Google often recommends about 500 to 1,000 characters.
Describe only the product
Include material, size, use and specifications. Avoid links, payment details and competitors.
Separate requirements and advice
5,000 characters is a hard limit; 500 to 1,000 is guidance, not an automatic error.
Use concrete details
Dimensions, weight and capacity make copy specific but cannot prove completeness without context.
