Checklists for software errors, setup, and tool workflows.

1. Reproduce

2. Isolate

3. Apply

4. Verify

Latest checklists

You're working in VS Code, run npm install or node app.js, and get ...

You run npm install and get a permission denied error that mentions package.js...

Fix Nginx Upstream Connection Refused in Proxy Pass
When Nginx returns a 502 Bad Gateway or logs upstream connection refused

Using Git LFS Migrate on an Existing Repository
If you have a Git repository that already contains large files—like binaries, archives, or datase...

How to Fix Nginx 502 Bad Gateway in Docker Logs
If your Nginx container shows a 502 Bad Gateway error, it usually means Nginx cannot...

Git Merge Conflict: How to See the Diff Between Versions
When you run git merge and hit a conflict, Git pauses and marks the conflicting file...