Checklists for software errors, setup, and tool workflows.

1. Reproduce

2. Isolate

3. Apply

4. Verify

Latest checklists

If you manage multiple sites or services on different subdomains (like app.example.com, blog.exam...

You run npm run build and get an error like Error: Missing required environmen...

Fix pip install: Dependency Conflict and Permission Denied
When you run pip install and see messages about dependency conflicts or permission d...

Fix 'Permission Denied' When Using mkdir in VS Code Terminal
You're working in the VS Code integrated terminal and run a mkdir command only t...

Fix Windows Explorer Restarting After Crash
If Windows Explorer (explorer.exe) crashes and then keeps restarting, you may see the desktop fla...

Fix Nginx 'Permission Denied' Upstream Errors
When Nginx logs permission denied while connecting to an upstream (e.g., a Unix sock...