Test every code snippet and command before publishing

Broken code in a tutorial costs readers time and costs you credibility. Before you publish:

• Run every snippet in a clean environment, in the order the post presents it.
• State versions of languages, frameworks and tools.
• Show expected output so readers know when a step worked.
• Link a complete working repository for anything longer than a few snippets.

When versions change, either update the post with a dated note or mark it clearly as written for an older version. Readers forgive old posts; they do not forgive posts that pretend to be current and fail.