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 'project/.git/index.lock': File ex...

VSCode Integrated Terminal Not Showing: Fixes to Try
You open the integrated terminal in Visual Studio Code using Ctrl+` (or Cmd+`<...

How to Fix Firefox Secure Connection Failed Error
When Firefox shows 'Secure Connection Failed' and won't load a site, it usually means...

Fix Node Sass Build Failure: Environment Variable Errors
When you run npm install or a build script and see an error like Node Sass doe...

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 Chrome Certificate Error Invalid Authority on Mac
You're browsing in Chrome on a Mac and suddenly see a warning: Your connection is not...