Checklists for software errors, setup, and tool workflows.

1. Reproduce

2. Isolate

3. Apply

4. Verify

Latest checklists

When you run git merge and hit a conflict, Git pauses and marks the conflicting file...

When Nginx returns upstream connection refused in your error logs, it means Nginx tr...

If you see “fatal: remote origin already exists” when trying to git remote add origin

Fix Docker Build Context Canceled by Excluding Files
You run docker build and after a long wait see context canceled. This o...

Python Virtual Environment Not Activating on Ubuntu: Fixes
You've created a Python virtual environment on Ubuntu, but when you run source venv/bin...

Docker Container Exits Immediately in Foreground Mode: Fixes
You run a Docker container with docker run -it myimage and it exits immediately. The...