Checklists for software errors, setup, and tool workflows.

1. Reproduce

2. Isolate

3. Apply

4. Verify

Latest checklists

You try to merge two Git branches and get this error:

fatal: refusing to merge unre...

Fix ERR_CONNECTION_RESET on Chrome for Android
If you see the ERR_CONNECTION_RESET error in Chrome on your Android phone or tab...

How to Manually Remove a Stuck Git index.lock File
If Git operations suddenly fail with an error like fatal: Unable to create 'path/.git/i...

Fixing Nginx Upstream Connection Refused in Load Balancing
When Nginx load balancing returns upstream connection refused, it means one or more ...

How to Fix Nginx Redirect Loop 302 Errors
You're seeing a 302 redirect loop in Nginx — the browser keeps bouncing between URLs until it...

How to Fix Chrome Profile Sync Error
You open Chrome and see a message like 'Sync is paused' or 'Profile sync error.' ...