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 &#...

Fix Git 'index.lock file exists' Error

If you see fatal: Unable to create 'path/.git/index.lock': File exists. when...

Fixing Nginx 502 Bad Gateway in Docker Networks

You have an Nginx container proxying requests to another container (like a PHP-FPM or Node app), ...

Fix VS Code Terminal Not Opening Due to Settings

You click the terminal panel icon in VS Code, but nothing happens. The panel doesn't slide up...

Windows Security App Not Opening: Practical Fixes

If the Windows Security app won't open—clicking the icon does nothing, or it crashes immediat...

How to Fix Git Refusing to Merge Unrelated Histories

When you try to merge two Git branches that have no common commit history, Git stops you with the...