Checklists for software errors, setup, and tool workflows.

1. Reproduce

2. Isolate

3. Apply

4. Verify

Latest checklists

If your Mac slows down when Chrome is open, or you see high memory usage in Activity Monitor, you...

When you run git merge and get error: merge conflict followed by ...

How to Fix 'Git Remote Origin Already Exists'
If you see the error fatal: remote origin already exists when trying to run gi...

How to Fix Git Merge Conflict Permission Denied Errors
You're in the middle of a git merge, and instead of the usual conflict markers, you see

Fix Nginx Upstream Connection Refused in Docker
You have Nginx running, either on the host or in a container, proxying to another Docker containe...

Fix pip Externally Managed Environment Errors
If you're on a modern Linux distribution and see error: externally-managed-environment<...