I understanding that writing keywords that are invisible to humans but recognizable to search engine crawlers is keyword stuffing and in violation of Google's guidelines.
In my E commerce website every product page has SEO section, Under this section it has a keyword section that allows 1000 characters. If I use different related keyword phrases that describes the product such that the total characters used is close to 1000, will that be considered keyword stuffing? Similarly the alt image section has 250 characters. If I use different related words totally close to 250 characters, is it also considered as keyword stuffing?