Checklists for software errors, setup, and tool workflows.

1. Reproduce

2. Isolate

3. Apply

4. Verify

Latest checklists

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

Fix Chrome Access Violation Error on Windows 7
If you see an "access violation" error in Chrome on Windows 7, it usually means Chrome tr...

Fix Nginx Configuration Test Failure from Rewrite Rules
You run nginx -t and get an error. The log points to a rewrite rule. This is common ...

How to Set Python Path in Windows 10
If you've installed Python on Windows 10 but get 'python' is not recognized

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

How to Fix a Detached HEAD with Git Reset --hard
You're working in Git, and suddenly you see a warning: You are in 'detached HEAD...