Hi @jhops! Write.as automatically takes care of generating metadata and optimizing your SEO for you (ie: generating metadata tags, showing any images in social media previews, etc).
As far as further optimization goes, I’d recommend adding titles to post (which most already do), adding an image if you want a different one other than the Write.as logo to show up in the social media previews, and adding “alt” text to images that describe the photo - in Markdown it looks like this: 
.
Hope that makes sense and let me know if you have further questions!