Checklists for software errors, setup, and tool workflows.

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Latest checklists

When you see the error fatal: Unable to create 'path/.git/index.lock': File exists....

Fix Firefox Secure Connection Failed on Windows 10
You're browsing in Firefox on Windows 10 and get a full-page error: Secure Connection Fai...

Fix Git Authentication Failed in VS Code on Mac
If you see "Git authentication failed" when pushing or pulling in VS Code on a Mac, the p...

Fix 'Python' Command Not Found on Windows 7
When you type python in Command Prompt on Windows 7 and get 'python' i...

Fix Nginx Permission Denied Errors on Ubuntu
If you're seeing permission denied errors in your Nginx error log on Ubuntu, the...

Fix Nginx Configuration Test Failed on Ubuntu
When you run nginx -t on Ubuntu and get an error, Nginx won't reload or restart....