Checklists for software errors, setup, and tool workflows.

Fix 'git pull failed index.lock file exists' Error

When running git pull, you may see an error like:

fatal: Unable to create &#...

Windows Security App Not Opening on Windows 10: Fixes That Work

When you click the Windows Security icon in the Start menu or taskbar and nothing happens, it’s u...

How to Fix a Detached HEAD in Git Using SourceTree

If you open SourceTree and see a message like “You are in ‘detached HEAD’ state,” it means your w...

Fix Nginx Configuration Test Failure in Docker

When you run nginx -t inside a Docker container and get an error, the container usua...

How to Fix Windows Update Service Error 1053

You see error 1053 when the Windows Update service fails to start or respond in time. The full me...

Fix 'fatal: refusing to merge unrelated histories' in Git

You cloned a repository, made some commits locally, and now when you try to git pull...