Checklists for software errors, setup, and tool workflows.

1. Reproduce

2. Isolate

3. Apply

4. Verify

Latest checklists

You're seeing a 522 error from Cloudflare. That means Cloudflare connected to your origin ser...

You run pip install somepackage on Windows and get a PermissionError

DNS Probe Finished NXDOMAIN vs Server Not Found: Key Differences
When you see a 'DNS probe finished NXDOMAIN' or 'Server not found' error in your ...

Fix Git 'index.lock file exists' Error
If you see fatal: Unable to create 'path/.git/index.lock': File exists. when...

Git Detached HEAD Warning Explained: Causes and Fixes
You see a warning: "You are in 'detached HEAD' state." This happens when you chec...

How to Enable Breakpoints in VS Code
If you've set a breakpoint in Visual Studio Code and it's not being hit, or you're no...