✗ Spend hours cleaning up duplicate and missing data
✗ Even when you ask AI, the answers end with just the chat window
✗ Explain the same rules again for every new task
✗ It doesn’t come out right the first time, so I end up fixing it myself.
✗ Keep putting off using AI because you don't know how to code
✓ With a single instruction, an organized file appears on your desktop
✓ Review the plan → approve → execute, with no rework
✓ Save the rules in AGENTS.md—no explanation needed.
✓ Improve quality through an instruct-review-refine loop
✓ Complete everything from organization to web pages without coding
📋 Planning and operations professionals tired of repetitive tasks — those who spend time organizing data and writing reports
😤 Professionals disappointed after using AI — those who ended up fixing the results themselves because they didn’t meet expectations
🌐 Professionals who want to create web content without coding — those who want to create their own profile page
😩 Office workers tired of giving the same explanations every time — those who are fed up with having to explain the rules and tone of voice again and again
Rather than simply learning how to converse with AI, this is designed as a single, cohesive process—from setting up the environment to standardizing work rules.
From installation to separating projects and work folders and configuring approvals, set up an environment where you can delegate real work.
Learn how to write instructions that get your message across in one go using the five key elements: goal, materials, criteria, format, and completion conditions.
Verify the initial result and request revisions in the same thread to refine it into the finished product you want.
For complex tasks, first review and approve a step-by-step plan before execution to reduce unnecessary rework.
Store formats, standards, and prohibitions in AGENTS.md so tasks are handled with consistent quality every time without having to explain them repeatedly.
Codex handles repetitive tasks, allowing you to focus on important decisions and setting direction.
Complete your desired result in one go using five formulas: goal, materials, criteria, format, and completion conditions.
Through an instruction, verification, and refinement loop, turn the initial result into the finished product you want through conversation.
Until just recently, data cleaning and report writing that took days of manual work can now be handled with a single natural-language instruction.
This Codex course goes beyond simply learning how to converse with AI.
It covers the “art of delegation”: safely granting permissions to an AI employee that remembers your work context, assigning tasks based on clear requirements, and having it place polished, practical files directly on your desktop.
• ChatGPT (including Codex)
: You can start with the free plan; paid plans provide greater usage limits.
• Windows File Explorer
: Work folder structure (no separate installation required)
* The programs are not provided.
• Depending on the ChatGPT environment and version updates, the screen (UI) layout or features shown in the course may differ from those available at the time of viewing.
• This course focuses on core concepts and practical applications based on the version available at the time of recording; revisions or additions resulting from subsequent updates are not provided.
• The availability of free credits for using Codex and the pricing of plans may change or be discontinued according to the policies of each service provider. Before using the service, be sure to check the latest policies and pricing of the relevant service.
Q. Can I take the course even if I don’t know anything about coding?
Yes, it is possible. This course is not about learning code syntax; it teaches you how to give Codex instructions in natural language and review and refine the results. Starting with Codex installation and its interface, it covers everything step by step—from writing prompts and verifying results to making revisions through conversation—so even beginners can follow along comfortably.
Q. Is paying for a paid plan required to use Codex?
Codex is accessed by logging in with a ChatGPT account. It is included in all ChatGPT plans, including Free and Go, so you can get started with a free account. However, usage limits vary by plan. The available plans and usage limits may change according to OpenAI policies, so please check the official guidance available at the time of enrollment.
Q. Can the prompting techniques learned in the course be applied directly to actual work?
Yes, this course is designed with practical application in mind. The exercises are based on work scenarios that employees actually encounter every day, such as cleaning messy raw data, creating Excel summary tables, writing insight reports, and building landing web pages. After completing the course, you can immediately apply what you learned to your work by simply replacing the data with data from your own role.
📌 It would be helpful to prepare a dual monitor or an extra device so you can display the practice screen separately.
📌 Since the course is conducted on Windows OS, we recommend taking it in a Windows environment.
📌 The course materials and practice files are available at <00. Course Material Download Center>.
The instructor explains things so well that even the difficult parts come across clearly without being boring.
I checked out Codex because I was curious, and I think it would be great for people who regularly do a lot of Excel and report work.
It was really helpful that you explained how to achieve the result I wanted, and I was amazed that you could even create a webpage!
It seems like I’ll be able to make proper use of AI agents in my work even without development knowledge. The instructor explains things very well~
I wanted to try Codex, and thanks to you, I now have a better sense of how to make good use of it!
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