Checklists for software errors, setup, and tool workflows.

1. Reproduce

2. Isolate

3. Apply

4. Verify

Latest checklists

You've cloned a repo, added a new remote, and now you need to merge two branches that don'...

When you see the error fatal: Unable to create 'path/.git/index.lock': File exists....

Fix 'Python' Command Not Found in Windows 10
When you type python in Command Prompt and see 'python' is not recogni...

Fix Docker Volume Permission Denied in Containers
You start a container with a bind mount volume, and the application inside can't write to it....

Fix Git Merge Conflicts with Deleted Files
You're in the middle of a merge and git stops with a conflict. One side deleted a file, the o...

Python Virtual Environment Not Activating on Mac: Fixes
You open Terminal, run source venv/bin/activate, and nothing happens—or you get an e...