A: USE DESCRIPTIVE ALT TEXT!
Alt text (text that describes an image) improves accessibility for people who can't see images on web pages, including users who use screen readers or have low-bandwidth connections.
Google uses alt text along with computer vision algorithms and the contents of the page to understand the subject matter of the image. Also, alt text in images is useful as anchor text if you decide to use an image as a link.
When choosing alt text, focus on creating useful, information-rich content that uses keywords appropriately and is in context of the content of the page. Avoid filling alt attributes with keywords (keyword stuffing) as it results in a negative user experience and may cause your site to be seen as spam.
* Bad (missing alt text): Image name ~ "puppy.jpg"
* Bad (keyword stuffing): Image name ~ "puppy.jpg" Alt text ~ "puppy dog baby dog pup pups puppies doggies pups litter puppies dog retriever labrador wolfhound setter pointer puppy jack russell terrier puppies dog food cheap dogfood puppy food"
* Better: Image name ~ "puppy.jpg" Alt text ~ "puppy dog"
* Best: Image name ~"puppy.jpg" Alt text ~ "Dalmatian puppy playing fetch"