Checklists for software errors, setup, and tool workflows.

1. Reproduce

2. Isolate

3. Apply

4. Verify

Latest checklists

You're in the middle of a push or pull in VS Code, and you get a red error: "Authenticati...

After restarting nginx, you might see errors like connect() to unix:/var/run/php-fpm.sock f...

Docker Prune Not Freeing Enough Space: Practical Fixes
You run docker system prune -a expecting a big space recovery, but the freed space i...

Docker Nginx 502 Bad Gateway: Memory Limit Fix
You're running Nginx in Docker as a reverse proxy, and suddenly you see 502 Bad Gateway error...

Fix Node.js Out of Memory When Building React Apps
When building a React app, you might see a fatal error like FATAL ERROR: Ineffective mark-c...

Fix Cloudflare Origin Certificate Mismatch Errors
If you see 'Origin Certificate Mismatch' in Cloudflare or browser warnings, it usually me...