Primary reference sources

These are the sources we prefer when a guide needs precise steps or security guidance:

Image credits (Wikimedia Commons)

All images are hotlink-safe and come from Wikimedia Commons under open licenses. License details are on each file page.

How to request a source

If you want us to add a specific official link to a guide, email the page URL and the source you’d like us to consider. We’ll include it if it’s relevant and authoritative.

Note: We avoid linking to sites that block hotlinking, use aggressive tracking, or publish unclear instructions without a trustworthy editorial process.