Oh yeah. Lots of info in CONTRIBUTING.md <!-- all commented out --> I agree that is confusing.

I didn't really understand why @michael63-osm decided to comment out the whole thing. There's certainly some sentences there which are still valid. I'm happy to have a go at doing a less brutal pruning of the info if that helps.

I see in the discussion here he said
"I will add some hints about the structure of the documents in the near future."
but that was early 2020.

Sorry for the confusion, I was not really aware that people pay attention to this file.

The modification to that file was around the time when we started writing a couple of documents for people who want to help:
https://github.com/hotosm/learnosm/blob/gh-pages/_posts/en/0150-09-20-translator_en.md as a guide for how to translate the contents from English and
https://github.com/hotosm/learnosm/blob/gh-pages/_posts/en/0150-06-20-images-translator_en.md as a guide for how to provide localized images.

You will be directed to these pages when you click on the pencil icon at the top right of each page. What is missing is a guide how to contribute new English contents. I would prefer to add that one to the other two documents, wouldn't mind including them all as links in CONTRIBUTING.md but am of course open to other suggestions.

The previous translation workflow outlined in CONTRIBUTING.md is no longer supported since we switched to Transifex.

Ah yes. There is quite a lot of 'contribute' info elsewhere. Actually a good generic explanation I hadn't noticed is the three paragraphs here: https://github.com/hotosm/learnosm#contributing . Also, as you say, "when you click on the pencil icon" https://learnosm.org/en/contribute/ there's another generic single paragraph on a "contribute" homepage.
Lot of different places. Maybe deleting the CONTRIBUTING.md (to avoid github's auto-linking) file does make the most sense: #652

Maybe deleting the CONTRIBUTING.md (to avoid github's auto-linking) file does make the most sense

I would rather replace its contents by links to a documentation if it exists elsewhere