Checklists for software errors, setup, and tool workflows.

Git Merge Unrelated Histories: When and How to Use --allow-unrelated-histories

You try to merge two branches and get fatal: refusing to merge unrelated histories. ...

Fix Nginx 'upstream connection refused' When Talking to PHP-FPM

You're seeing upstream connection refused in your Nginx error log, and your site...

Fix Windows 11 Blue Screen After Update with System Restore

If you're seeing a blue screen after installing a Windows 11 update, System Restore can often...

Fix ERR_CONNECTION_RESET Caused by Chrome Extensions

If you see the ERR_CONNECTION_RESET error in Chrome, it often means a network connection was inte...

Fix Git index.lock File Exists Permission Denied Error

You're in the middle of a Git operation and suddenly you see:

fatal: Unable to ...