Checklists for software errors, setup, and tool workflows.

1. Reproduce

2. Isolate

3. Apply

4. Verify

Latest checklists

If you see 'Git authentication failed' or 'permission denied' when pushing or pul...

You run git push and see: ! [rejected] main -> main (non-fast-forward)

Python Virtual Environment Not Activating on Ubuntu: Fixes
You've created a Python virtual environment on Ubuntu, but when you run source venv/bin...

Fix npm run build Exit Code 1: Common Causes and Solutions
When you run npm run build and see "exit code 1", it means the build script ...

Fix npm run build Failed with PostCSS Error
You run npm run build and see a PostCSS error. This often happens after updating pac...

Git index.lock File Exists: Quick Fix Checklist
You try to run a Git command and see fatal: Unable to create 'path/.git/index.lock'...