Checklists for software errors, setup, and tool workflows.

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Git index.lock File Exists Even After Deleting: Fixes

You delete the .git/index.lock file, but Git still says it exists. This can happen d...

Fix Nginx Upstream Connection Refused in Docker

You have Nginx running, either on the host or in a container, proxying to another Docker containe...

VSCode Terminal Not Opening on Ubuntu: Fixes That Work

You open the integrated terminal in VSCode on Ubuntu, but nothing happens—no shell, no error, jus...

Windows 11 Update Blue Screen Error Code: How to Fix

If you see a blue screen with an error code after applying a Windows 11 update, you're not al...

Fix 'npm package json not found' Error When Using npx

When you run npx some-package and see an error like “npm package json not found”...

How to Fix Windows Update Error 0x800f081f (Missing Files)
You see error 0x800f081f when running Windows Update, often with a message like 'The source f...