The Dev Environment & Runtime Debugging Bundle

Fix the most common “everything is broken” dev problems without guessing.

This bundle includes 3 PDF guides:

1. Why Your .env File Isn’t Loading
   And the 5 Places to Check First
2. Why Your Tests Pass Locally but Fail in CI
   And How to Fix It Without Guessing
3. Why You’re Getting CORS Errors
   And How to Fix Them Without Guessing

Each guide focuses on one frustrating problem and walks through the real causes and a clear fix checklist.

These are the problems that waste the most time in day-to-day development.

• Environment variables that are suddenly undefined
• Tests that pass locally but fail in CI
• APIs that work, but browsers block with CORS errors

They’re common. They’re annoying. And they’re rarely explained clearly.

This bundle pulls together three focused troubleshooting guides designed to help you fix these problems quickly, without trial and error.

Each guide is short, practical, and checklist-driven. No filler. No framework lock-in. Just the real reasons these issues happen and how to resolve them.

What you get

• 3 PDF troubleshooting guides
• Clean, skimmable layouts
• Step-by-step debug checklists
• Explanations in plain English
• References you can reuse when the problem comes back

What this bundle is NOT

• Not a course
• Not a collection of blog posts
• Not generic debugging advice

This is a set of practical references you can reach for when things aren’t working, and you just want them fixed.

Who this bundle is for

• Developers tired of Googling the same problems
• Anyone blocked by environment or runtime issues
• Frontend, backend, and full-stack developers
• Teams who want these problems to be boring again

If you’ve ever lost hours to one of these issues, this bundle will save you time the next time it happens.