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 Windows Security App Missing from Start Menu

You open the Start menu, type “Windows Security,” but nothing appears. The app may have been unre...

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...

Docker Container Exits Immediately: How to Find Logs and Fix It

You start a Docker container and it stops within seconds. The status shows "Exited (0)" o...

Git Push Large File Timeout Error: Fixes and Workarounds

You're trying to push a commit that includes a large file—maybe a dataset, a binary, or a gen...

Fix 'package.json Not Found' After Cloning a Repository

Symptom

You clone a repository from GitHub (or another remote), change into the directory...