Checklists for software errors, setup, and tool workflows.

Fixing VS Code Git Authentication Failed Error

If you see "Git authentication failed" when pushing or pulling in VS Code, it usually mea...

Nginx Upstream Connection Refused: Diagnosis and Fixes

When Nginx returns a 502 Bad Gateway or logs "upstream connection refused", it means Ngin...

Fix Docker 'network not found' Error for Custom Networks

You create a custom Docker network, then try to run a container attached to it, but get an error ...

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

Symptom

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

Docker Compose Environment Variable Not Working: Fixes

You define a variable in a .env file or directly in docker-compose.yml, but your container sees n...

How to Manually Remove a Stuck Git index.lock File

If Git operations suddenly fail with an error like fatal: Unable to create 'path/.git/i...