Checklists for software errors, setup, and tool workflows.

1. Reproduce

2. Isolate

3. Apply

4. Verify

Latest checklists

You open Chrome, it starts to load, then crashes before the window fully appears. This can happen...

If you see an error like fatal: Unable to create 'project/.git/index.lock': File ex...

Common Causes of Nginx Configuration Test Failure
When you run nginx -t and see an error, it usually means a syntax mistake, a missing...

How to Fix npm Install Permission Denied on Mac
If you see EACCES: permission denied when running npm install, it's...

Fix VS Code 'Cannot Save File: Permission Denied' on Mac
You're editing a file in VS Code on your Mac, hit save, and get: 'Failed to save:...

How to Fix Git Detached HEAD State and Undo Changes
You run git status and see something like "HEAD detached at abc123". This ha...