Checklists for software errors, setup, and tool workflows.

1. Reproduce

2. Isolate

3. Apply

4. Verify

Latest checklists

When you see the error fatal: Unable to create 'path/.git/index.lock': File exists....

Pip Externally Managed Environment Error: Causes and Fixes
When you run pip install and get the error error: externally-managed-environme...

Fix VSCode Terminal Not Opening with Python
You try to run a Python script in VSCode, click the terminal tab, and nothing happens—or the term...

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

Fix 'git pull failed index.lock file exists' Error
When running git pull, you may see an error like:
fatal: Unable to create &#...

Resolving Git Merge Conflicts in package-lock.json
If you work on a Node.js project with multiple contributors, you've likely seen a merge confl...