I read the Solid homepage (https://solid.mit.edu/). I got to the bottom of the page. I don't know what Solid is. Might read it again with a coffee later.
@meredevelopment I have been working for some time in something that is conceptually the same thing. I wrote some explanation long ago with concrete examples, maybe that can help https://noeldemartin.github.io/autonomous-data/
This is an instance-of-one managed by Noel De Martin.