AI Applications / Zero-Base Introduction

Help AI Understand You Better: From Knowing You to Helping You Act

Most people think of a digital twin as a face that looks like yours. But the one that can actually help you with things, the key has never been in the appearance.

You may already be using ChatGPT, but it sometimes answers well and sometimes isn't what you want, and you have to explain the same thing over and over again. Most people's first reaction is to learn better prompts, but the problem often lies even further back: how well it actually knows you. This article explains the misunderstandings about 'digital twins' and gives you three settings you can complete in ten minutes on your phone, turning AI from 'being able to chat' into 'being able to help.'

Who is this for
  • Already using ChatGPT but find its answers are not enough, and you have to explain the background again every time.
  • Have heard of 'digital twins' but only think of virtual personas, unsure how it relates to your work as an operator.
  • If you only have a phone and cannot touch a computer, you can still start using AI in your work.
What you can take away
  • A judgment standard: distinguishing between 'a digital twin that looks like you' and 'an agent that understands you and can help you do things,' and knowing what each is suitable for.
  • A prompt you can directly read to AI, letting it write your own self-description.
  • Three steps you can complete on your phone, including a method that lets you immediately see the results.

Two Imaginations of Digital Twins

Now when talking about 'digital twins,' most people imagine this scene: a virtual person who looks like you, speaks with your voice, can lip-sync, and can record videos.

That thing definitely has value. If you are doing self-media, making short videos, or needing to produce marketing materials in bulk, replicating the appearance is what you need.

But that's just the surface. It doesn't know what industry you're in, doesn't know how you judge whether to take on a task, and doesn't know what you care most about when negotiating a collaboration. It looks like you, but its mind is empty.

Common Imagination Replicating Appearance

Looks like you, speaks like you. For self-media, marketing, and short videos, this is indeed useful, and you need the 'face time.'

But he doesn't know how you think or how you make decisions.

Key points of the Agent era Copy the way of doing things

Understanding how you do things, understanding your thinking, and understanding your decision-making, so he can help you do things.

If you want to copy an entire workflow, not just the appearance, you need this kind.

Think of it as training an employee

This is how I understand it.

Training a new employee, what you want is not for him to look like you. What you want is for him to know how you do things: how to quote for this kind of case, how you would reply to this customer question, and what situations require you to consult you before making a decision.

This is what it means to train a person. When training an AI employee, I want him to know how I do things. His appearance is secondary.

Without this step, it will always remain at the level of general advice, because it is facing a person it doesn't know.

From 'understanding me' to 'being able to help me do things'

These two things are connected, and the order cannot be reversed.

First layer: understanding me

It knows who you are, what you do, and what you care about. Once this layer is done, you will feel its answers become more stable, and you don't need to explain the background every time.

Second layer: being able to help me do things

When it understands you well, what it gives is no longer just 'reference directions,' but things you can directly use. It can write a quotation letter in your tone, and it can break down customer questions according to your logic.

Most people are stuck at the first layer and try to jump to the second layer, then complain that AI is not useful.

Three things you can do on your phone

No need for a computer, no need to learn programming. The following three things can all be done on the ChatGPT mobile app, and can be completed in ten minutes.

1. Set custom instructions

This is the most direct step. Tell ChatGPT who you are, what industry you are in, and how you hope it will respond to you. Set it once, and it will remember every time after that.

If you don't know how to write it, let it help you. Open ChatGPT, and use voice input to read this out:

I will introduce myself by speaking: who I am, what industry I am in, what I am good at, and what I usually need you to help me with. You listen and organize as you go, and finally help me write a paragraph that can be placed in the 'custom instructions' section.

After reading, it will organize it into a paragraph of text. Paste that paragraph into the custom instructions field in the settings, and you're done.

2. Turn on memory function

After turning it on, it will keep the important information you have told it, so you don't need to repeat it every time. This function is not necessarily enabled by default, so it's worth checking in the settings.

3. Use the same question for verification

This step is often skipped by many people, but it is the most impactful part of the whole process.

Ask a question you asked before setting up, and then ask it again after setting up. The same question, the same AI, the answer will be noticeably different. That difference is the concrete meaning of 'understanding you better,' clearer than any explanation.

If you haven't thought of what to ask yet, use this question, as it forces the AI to use its understanding of you:

Based on what I now know about you, which three things in your current work are most suitable to be handed over to you to handle? For each, say why it is suitable for me.

Before setting up, it can only give you a general answer. After setting up, it will start talking about your industry and your situation.

A limitation to be aware of

By the way, there is a common misunderstanding. Some people think: Why don't I just create my own GPT?

ChatGPT mobile app currently cannot create your own GPT GPT Builder is a feature available only on the web version. The mobile app can only 'use' others' GPTs, but cannot 'create' them. (Verified from OpenAI's official documentation in July 2026)

Therefore, if you only have a mobile phone, you don't need to go in this direction. Doing the above three things well will have the same noticeable effect, and you can complete it today.

If you are using the computer version

The above three things are the foundation. After the foundation is done, there is still a path to go up.

The advanced tools on the desktop version (like Codex, desktop Claude) can do more: they can directly read files on your computer. If you already have organized your data and have your own knowledge base, the depth of what the AI can talk about will be completely different.

Order issues First, organize your data, and then the AI can help you. Many people think about 'waiting for the AI to be stronger,' but even if the AI is stronger, it can't read your stuff if it can't read it.

Conclusion

Whether the AI is useful or not has a large part to do with how well it knows you, not how strong the model is.

Making the AI know you is lower than most people think: a self-description, a setting, and a verification. Three things, which can be done in ten minutes on a phone.

After doing this, your AI will go from 'being able to chat' to 'being able to help you.'

AIAgent Prompt design Tool operation Zero-base entry