Checklists for software errors, setup, and tool workflows.

1. Reproduce

2. Isolate

3. Apply

4. Verify

Latest checklists

You've made several edits, then checked out an old commit or tag, and now Git says you're...

When building a React app, you might see a fatal error like FATAL ERROR: Ineffective mark-c...

How to Fix 'Permission Denied' Error in Python pip Install
When you run pip install and see a "Permission denied" error, it usually mea...

Fix npm run build TypeScript Compilation Errors
You run npm run build and get a wall of TypeScript errors. The build fails, and you&...

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

How to Migrate and Push with Git LFS
If you've added large files to a Git repository without Git LFS, you might encounter errors w...