Checklists for software errors, setup, and tool workflows.

1. Reproduce

2. Isolate

3. Apply

4. Verify

Latest checklists

You try to push your local commits to a remote Git repository, but Git refuses with: ! [rej...

Fix git index.lock File Exists Error on Windows
If you see fatal: Unable to create 'index.lock': File exists. when running G...

Fix Firefox Secure Connection Failed on Mac
If you see "Secure Connection Failed" in Firefox on your Mac, the browser is blocking the...

Fix 'docker network not found' After Prune
If you run docker network prune and later see errors like network not found

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

Fix VS Code Terminal Not Opening Due to Settings
You click the terminal panel icon in VS Code, but nothing happens. The panel doesn't slide up...