Checklists for software errors, setup, and tool workflows.

1. Reproduce

2. Isolate

3. Apply

4. Verify

Latest checklists

You open Chrome incognito and hit a warning: NET::ERR_CERT_AUTHORITY_INVALID. Th...

You're browsing in Chrome on a Mac and suddenly see a warning: Your connection is not...

Git Clone Connection Timed Out: Troubleshooting Checklist
When you run git clone and get a connection timed out error, the cl...

How to Set Node Version for a Project
When working on multiple projects that require different Node.js versions, you may encounter erro...

Fix Nginx Upstream Connection Refused in Proxy Pass
When Nginx returns a 502 Bad Gateway or logs upstream connection refused

How to Fix Git Detached HEAD and Checkout a Branch You're working in a Git repository, make some commits, and then realize you're in a '...