Checklists for software errors, setup, and tool workflows.

1. Reproduce

2. Isolate

3. Apply

4. Verify

Latest checklists

If you're seeing fatal: unable to access 'https://...': SSL certificate problem...

How to Bypass pip's Externally Managed Environment Error
When you run pip install on certain Linux distributions (like Debian 12, Ubuntu 23.0...

How to Create a package.json for Your npm Project
If you're starting a Node.js project, you'll need a package.json file. This ...

How to Fix Git Detached HEAD State and Undo Changes
You run git status and see something like "HEAD detached at abc123". This ha...

Git Merge --allow-unrelated-histories: When and How to Use It
You run git merge and get an error: fatal: refusing to merge unrelated histories...

How to Fix Node Version Mismatch in a Project
You cloned a project, ran npm install, and got errors about engine incompatibility. ...