Checklists for software errors, setup, and tool workflows.

Fix Nginx Configuration Test Failure for Upstream Directive

When you run nginx -t and get an error involving the upstream directive...

Understanding and Fixing Git Detached HEAD State

If you've seen the message You are in 'detached HEAD' state in Git, you ...

Windows Explorer Not Responding? Here's How to Fix It

Windows Explorer (now called File Explorer) freezing or showing "not responding" is a com...

Docker Pull Access Denied on Mac M1: Step-by-Step Fix

If you're running Docker on an Apple M1 Mac and see 'access denied' when pulling an i...

Git Fatal: Refusing to Merge Unrelated Histories – Workaround

You try to merge two Git branches and get this error:

fatal: refusing to merge unre...