Checklists for software errors, setup, and tool workflows.

1. Reproduce

2. Isolate

3. Apply

4. Verify

Latest checklists

When you type python in Command Prompt and see 'python' is not recogni...

Fix Git Clone Connection Timed Out via HTTPS
When cloning a repository over HTTPS, you may see 'Connection timed out' after a long wai...

Fix Cloudflare 521 Error: DNS Configuration Problem
If you see a Cloudflare 521 error page, it means Cloudflare's servers are unable to connect t...

How to Fix Git index.lock File Exists Error on Mac
If you're working with Git on a Mac and see the error fatal: Unable to create '/pat...

Fix npm ERR! enoent ENOENT: package.json Not Found in node_modules
You run npm install or npm start and get something like:
...

Python Requests: Connection Timeout vs Read Timeout
When using the Python requests library, you might encounter situations where a reque...