Checklists for software errors, setup, and tool workflows.

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Latest checklists

When you run git push and get an error like ! [rejected] main -> main (non-...

Fix VSCode Permission Denied on Save in Linux
You're editing a file in Visual Studio Code, press Ctrl+S, and see a red error: "Failed t...

Fix Windows Explorer Restarting with SFC Scannow
If Windows Explorer keeps restarting on its own—your taskbar disappears and reappears, or File Ex...

How to Fix the Git index.lock File Exists Error
You're in the middle of a Git operation—commit, merge, or rebase—and Git stops with: fa...

Fix npm run build Failed on macOS: Common Causes and Solutions
If you're on macOS and npm run build fails, you're not alone. This command o...

Fix Bluetooth Service Not Running in Windows 11
You open Bluetooth settings in Windows 11 and see the toggle is grayed out, or your Bluetooth dev...