Checklists for software errors, setup, and tool workflows.

Fix Nginx 502 Bad Gateway: Upstream Connection Refused

If you're seeing a 502 Bad Gateway error with "upstream connection refused" in your N...

Fix 'package.json Not Found' After Cloning a Repository

Symptom

You clone a repository from GitHub (or another remote), change into the directory...

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...

Fix 'Permission Denied' When Installing Python Packages Without sudo

If you see "Permission denied" when running pip install, you're not alon...

Windows Update Service Not Running in Windows 11: Fix It

If Windows Update won't start and you see an error like "Windows Update service is not ru...

Fixing Nginx 502 Bad Gateway in Docker: Practical Steps

You set up Nginx as a reverse proxy in Docker, but instead of your app you see a 502 Bad Gateway....