Checklists for software errors, setup, and tool workflows.

1. Reproduce

2. Isolate

3. Apply

4. Verify

Latest checklists

If you see Permission denied when running pip install --user somepackage

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'...

How to Fix Cloudflare 522 Error: Check Your Origin Server
If you're seeing a 522 Connection Timed Out error in your browser when visit...

Fix Node Sass Build Failed GYP Error: Step-by-Step Guide
When you see "node sass build failed" with a "gyp error" during npm install, it u...

Git Merge Unrelated Histories Without Losing Commits
You've cloned a repo, added a new remote, and now you need to merge two branches that don'...

Git Merge Conflict: How to See the Diff Between Versions
When you run git merge and hit a conflict, Git pauses and marks the conflicting file...