Checklists for software errors, setup, and tool workflows.

Fix npm run build Failed Due to Missing Dependencies

When you run npm run build and it fails with errors about missing dependencies, the ...

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 'Externally Managed Environment' Error on Linux

If you're on a modern Linux distribution (Ubuntu 23.04+, Debian 12+, Fedora 38+, etc.) and ge...

Windows Security App Not Opening: Practical Fixes

If the Windows Security app won't open—clicking the icon does nothing, or it crashes immediat...

How to Merge a Git Detached HEAD Back to Master

If you see a message like 'You are in 'detached HEAD' state' after checking out a...

Fix Virtual Environment Not Activating in Terminal

Why Your Virtual Environment Won't Activate

You open a terminal, navigate to your pro...