Checklists for software errors, setup, and tool workflows.

Docker Container Exits Immediately with Exit Code 137

You start a Docker container, and it exits almost immediately with exit code 137. This usually me...

Fix Cloudflare Origin Certificate Error After SSL Change

You changed your SSL/TLS setting in Cloudflare (for example, from Flexible to Full or Full Strict...

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

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

fatal: Unable to create &#...

Fix VS Code Breakpoint Not Hit in Express App

You set a breakpoint in your Express route handler, start debugging, and the breakpoint is never ...

Fix Nginx Configuration Test Failure on Location Directive

When you run nginx -t and see an error like [emerg] invalid location directive...