#5: Screen readers can't read pictures

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If you ever upload images to a library website or social media platform, see if you can figure out a way to add alt text to those images—a screen reader will read that alt text for a blind person who otherwise wouldn’t know what the image was about. This is especially important for, say, posters that include the logistical details for an event.

If you're not sure what to write, WebAIM has a good introduction to the purpose of alt text and how to use it well.