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Well, it isn't that very important but you can surely use image SEO to drive traffic to your blog.
So the few major parts to conentrate on image SEO are :
Image Filename
The actual image filename is the most important factor when optimizing your images. For example, if you have a photo of a green tea cup, you should name it…. green-tea-cup.jpg. No kidding! You, too, can do SEO.
Image ALT tags
The Image ALT text was designed for screen readers that would dictate the content to the visually-impaired. Though it wasn’t meant for SEO, ALT text is also a factor for image SEO. Like the image filename, it’s not brain surgery. Don’t overthink it. Use the ALT text attribute to further describe the image in better detail. If you recently took a trip to India and snapped a photo of a camel in the desert city of Khuri, the ALT text shouldn’t be “my trip to india1.”
Surrounding Content/ Image Captions
This one is a little less straight-forward, but what it boils down to is selecting an image that is related to the content of your post/article. Search engines take cues from the text content of the blog post/article.
More image SEO best practices:
Don’t overdo it by stuffing your tags with keywords
Use dashes instead of underscores
Capitalization doesn’t matter
Avoid using more than five words in filename or ALT text
Keep the image moderately-sized (between100x100 to500x500)
