What you need to know
Image search can help people discover relevant visual content, but oversized images and vague descriptions can harm usability. Search crawlers rely on the surrounding page context as well as image attributes.
How to apply it
Use a descriptive filename before upload, compress the file, provide responsive dimensions, and write alt text based on the image's purpose. Put important visual information near the image in page copy.
Common mistake to avoid
Do not stuff alt attributes with search phrases. If an image is decorative, an empty alt value can be the correct accessible choice.