Checklists for software errors, setup, and tool workflows.

1. Reproduce

2. Isolate

3. Apply

4. Verify

Latest checklists

You're typing code in VS Code, expecting autocomplete suggestions, but nothing appears. This ...

If you see FATAL ERROR: Ineffective mark-compacts near heap limit Allocation failed - JavaS...

Fix Node Version Incompatibility When Installing Packages
You try to install an npm package and get an error like Unsupported engine or ...

Fix 'Python Command Not Found' in Git Bash on Windows
When running Python in Git Bash on Windows, you may see bash: python: command not found

Fix Git SSL Certificate Problem on Corporate Networks
If you see git SSL certificate problem: unable to get local issuer certificate while...

Fix Cloudflare Wildcard Subdomain DNS Propagation Delay
You set up a wildcard DNS record (e.g., *.example.com) in Cloudflare, but new subdom...