Here are 11 image SEO tips you need to know:
1. Choose the Right Format
2. Compress Your Images
3. Create Unique Images
4. Beware of Copyright
5. Customize Image File Names
6. Write SEO-Friendly Alt Text
7. Think About the Image File Structure
8. Make Your Page Title & Description
9. Define Your Dimensions
10. Make Your Images Mobile-Friendly
11. Add Images to Your Sitemap