Checklists for software errors, setup, and tool workflows.

Fix Nginx Permission Denied for Static Files

Common Causes

When Nginx returns a 403 Forbidden or 'permission denied' error for...

Fix Nginx 502 Bad Gateway in Docker Containers

An Nginx 502 Bad Gateway error when proxying to a Docker container usually means Nginx cannot rea...

Fix Chrome Black Screen During Videos: Hardware Acceleration

If you're watching a video in Chrome and the screen goes black (but audio continues), hardwar...

Docker Container Exits Immediately: Fix with Restart Policy

You start a Docker container, it runs for a second, then stops. No error messages, just a quick e...

Fix Cloudflare Origin Certificate Not Trusted by Browser

You've set up Cloudflare with an origin certificate, but browsers show a warning that the cer...

How to Resolve Python pip Dependency Conflicts

You run pip install and see a wall of text about DependencyConflict or ...