Contact
Corrections, questions and topic suggestions are all welcome.
The fastest way to reach a human is email:
Expect a reply within a few working days. If your message is about a specific article, include the article title so it can be found quickly.
Corrections
If a command in an article does not do what the article says, say so and include the error output and the version you are running. Corrections that come with the failing output are acted on first, because they can be verified directly.
What is not handled here
This is an editorial site, not a support desk. For a problem with a specific vendor's product, their own support channel will be faster and more accurate than this mailbox.