This is the “Description” field of my profile at osm.org/user/m040601/

It is parsed with kramdown, https://kramdown.gettalong.org/quickref.html

Headings
 
# Heading
## Subheading

Unordered list

* First item
* Second item

Ordered list

1. First item
2. Second item

Link

[Text](URL)

Image

 ![Alt text](URL)

Code block

 ~~~
    Code block
 ~~~