Checklists for software errors, setup, and tool workflows.

1. Reproduce

2. Isolate

3. Apply

4. Verify

Latest checklists

You run pip install and see errors like “package A requires package B==1.0 but y...

Fix Cloudflare SSL Full Strict Error 526
If you see error 526 in your browser when using Cloudflare with SSL set to Full (Strict), it mean...

Fix Nginx Configuration Test Failure in Docker
When you run nginx -t inside a Docker container and get an error, the container usua...

Fix WiFi No Internet After Windows 11 Update
After a Windows 11 update, you might see your WiFi connected but with no internet access. This is...

Fix Nginx 502 Bad Gateway with Docker and PHP-FPM
You have a Docker setup with Nginx proxying to a PHP-FPM container, and you're getting a 502 ...

How to Fix Git Detached HEAD State and Undo Changes
You run git status and see something like "HEAD detached at abc123". This ha...