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The alt attribute of the image is first of all to provide alternative information when the image cannot be displayed, and also to allow users using Screen Reader to understand the image content.
It may indeed help search engines understand the image, but that doesn’t mean every alt text should be stuffed with one or two target keywords.
If the image is decorative, or the nearby text already fully describes the image information, the alt value can be an empty string alt="" to allow assistive technologies to skip the duplicate content.
If the image carries important information, the alt text should describe content that is truly useful for understanding the page.
The core reminder to save this article is: write alt text for users first, and then think about how it helps search engines, rather than distorting the image description for SEO.
Links mentioned in the original post
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