There was a huge push for "new coders" to start their own blogs about problems they encounter and such, especially as part of the bootcamp that I was working for. I wonder if that is still a thing.
Even though the technical skills I see explained are often quite basic, done well it's valid proof of whether they can explain something in writing, which comes up at my work a lot.
There's also value in having a beginner's perspective on stuff- What concepts weren't clear? Was there some documentation that was difficult for a beginner to grok? What helped the pieces fall into place?
There's a school of thought w.r.t. project documentation that encourages beginners to write beginner focused documentation since the people who are experts on the project don't always have the perspective to effectively communicate to beginners.