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The Web Accessibility Initiative has tons of content. For images, you can start from their tips to get started & tutorials that links to.
Here specifically, you can learn how to set alt text in markdown.
Ok, that’s helpful for providing alt text for images inside the body of a post.
Bus what about image posts? When using the web interface I don’t see any opportunity for entering the alt text. 🤔
Apparently, some instances offer it: you might want to ask your instance administrator to upgrade. If yours doesn’t offer it, the text alternative can be adjacent as stated in the success criterion for non-text content
and the techniques for it identified with prefix G. The
altattribute is merely 1 way to accomplish that.When it’s a screenshot of a webpage, a link to the source makes sense as a text alternative, but it might make more sense to eliminate the need for a text alternative altogether. I see way too many images that could be blockquotes & links, which are often superior to an image: more accessible & more useful to everyone else. That’s often the case of good accessibility: it benefits everyone else.