WordPress has multiple images in multiple locations. Those can be images inside of posts, featured images, icon images in menus, product images, logo image in header, images in footer for branding and many more. Therefore it is not possible to answer your question specifically with little details that you given.
Generally speaking you can use an SEO plugin such as Rank Math: http://rankmath.com/
It will allow you to add alt text to certain types of images.
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