Checklists for software errors, setup, and tool workflows.

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Latest checklists

If you see "npm run build" fail with a generic error message, you're not alone. The i...

When Nginx returns 502 Bad Gateway or logs upstream connection refused timeout...

Fix npm install Permission Denied in Home Directory
If you see EACCES: permission denied or similar errors when running npm instal...

How to Fix Git Push Rejected Non-Fast-Forward Error
You run git push and get ! [rejected] with non-fast-forward

Fix Git Pull Unrelated Histories Error: Step-by-Step
You run git pull and see: fatal: refusing to merge unrelated histories....

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