Checklists for software errors, setup, and tool workflows.

1. Reproduce

2. Isolate

3. Apply

4. Verify

Latest checklists

When Nginx returns a 502 Bad Gateway or logs upstream connection refused

Fix Git SSL Certificate Problem on Corporate Networks
If you see git SSL certificate problem: unable to get local issuer certificate while...

Git Merge Conflict Checklist Before Merging
You're about to merge a branch, but you've been burned by merge conflicts before. This ch...

How to Stop Nginx Redirect Loop: Practical Fixes
An Nginx redirect loop (too many redirects) usually appears as a browser error after multiple 301...

Fix 'python' Command Not Found in Windows PowerShell
When you type python in Windows PowerShell and see python : The term 'pyth...

Fixing Python UnicodeDecodeError in ftplib
When using Python's ftplib to download or list files from an FTP server, you mig...