Checklists for software errors, setup, and tool workflows.

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Docker Container Exits Immediately with Code 0: Fixes

You run a Docker container and it stops almost instantly with exit code 0. This means the main pr...

Fix Cloudflare Wildcard Subdomain and Root Domain Conflict

If you use a wildcard DNS record (e.g., *.example.com) on Cloudflare, you may run in...

Fix npm run build Failures After npm install

After running npm install, you may find that npm run build fails with c...

Node.js --max-old-space-size Setup Guide for Memory Issues

If your Node.js process crashes with a JavaScript heap out of memory error, you likely need to ad...

Nginx Permission Denied After Restart: Fixes That Work

After restarting nginx, you might see errors like connect() to unix:/var/run/php-fpm.sock f...

VSCode Breakpoint Not Hit Due to Source Maps: Fix
You set a breakpoint in your TypeScript or React source file, start debugging, and the breakpoint...