I graduated as a mechanical engineer in 2020, but with corona and other economic factors, the job market wasn't great.
That said, I was already working as a freelance writer for different brands via Upwork by then — since I had seen the writing on the wall after watching previous year's graduates.
Fast forward to now, I've worked for different SaaS brands, web hosting companies, and manufacturing businesses.
I've written knowledge base articles, user guides, technical white papers, and faq articles.
However, I'm still not an expert as my experience with user manuals, software documentation, and so on is bit lacking.
I think that's true for most the popular FOSS projects as great documentation is an essential ingredient for getting more users.
That said, if I have to name one, I love the docs of Plex Meta Manager (now called Kometa). It has step-by-step guides, reference pages, and even example code to help the users.