Question 4

Provide a link to documentation for a technical/developer-focused product, which you think are well done, and explain why you think they are well done.

The Rust Book is my latest favorite documentation due to the content most of all.

I think Rust has a fantastic community that has done a great job making a very technical language approachable. On top of the book they have created a really nice beginners project called rustlings using a github repository. Also a nice "Rust by Example" reference that goes deep into things one might use for reference.