Checklists for software errors, setup, and tool workflows.

Fix 'port already allocated' for Nginx in Docker Compose

You're starting your Docker Compose setup with Nginx, and you see "port is already alloca...

Docker Container Exits Immediately After Start: Network Fixes

You start a Docker container and it exits right away. The container logs show no errors, or the e...

Why Cloudflare DNS Changes Aren't Propagating

You updated a DNS record in Cloudflare but the change isn't showing up. Visitors still see th...

Windows 11 Update Stuck at 0%: How to Fix

You click 'Check for updates' and see the download stuck at 0% for minutes or hours. This...

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

Symptom

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

How to Fix Cloudflare 522 Error (Firewall Blocking)

If you see a Cloudflare 522 error, the connection between Cloudflare and your origin server timed...