Checklists for software errors, setup, and tool workflows.

1. Reproduce

2. Isolate

3. Apply

4. Verify

Latest checklists

If you see an error like fatal: Unable to create 'path/to/repo/.git/index.lock': Fi...

npm package.json Not Found After npm init
You run npm init, answer the prompts, and then try to install a package or run a scr...

Fix 'pip install externally managed environment' Error
If you're seeing pip install fail with a message about an externally managed env...

Fix 'Git Remote Origin Already Exists' Without Deleting
When you run git remote add origin <url> and see fatal: remote origin al...

pnpm audit fix not working: common causes and fixes
When you run pnpm audit fix and it fails, you might see messages like "No fixes ...

Fix Git SSL Certificate Problem: Unable to Get Local Issuer
You run git clone https://example.com/repo.git and get:
fatal: unable to acc...