Checklists for software errors, setup, and tool workflows.

1. Reproduce

2. Isolate

3. Apply

4. Verify

Latest checklists

You're browsing in Chrome and see a full-page warning: Your connection is not private...

Chrome Extensions Not Loading? 7 Fixes to Try
You open Chrome and notice your extensions are missing from the toolbar, or they show up but don&...

How to Fix Nginx Upstream Connection Refused on Port 80
When nginx logs show "upstream connection refused" while connecting to port 80, it means ...

Fix Git Lock File Not Deleted After Crash
If Git reports a lock file error after a crash, it usually means a previous Git operation was int...

Resolve Python Package Version Mismatch Errors
You run pip install and see errors like “package A requires package B==1.0 but y...

Fix npm run build Permission Denied on Linux
You run npm run build on your Linux machine and see Permission denied. ...