Chapter 9. Markdown — the standard format for an age of AI

Key points

• Markdown is a simple way of writing that uses just a few symbols
• It is the easiest thing for AI to handle: light, openable anywhere, readable far into the future
• There are only a handful of marks — and if you cannot remember them, the AI will convert for you

From here on: from consuming information to holding it

By now you have the feel of handing files to AI and working with them. Part 4 goes a step further.

So far the pattern has been: hand over a file, receive a summary or a rewrite. That is consuming information once. From here, we move to

accumulating information as an asset, and growing it

The keys are a way of writing called Markdown and a tool called Obsidian.

What Markdown is

Markdown is

a simple way of writing where a few symbols express headings and lists

Files have the extension .md.

Why is this the standard format for an age of AI? Four reasons.

1. It is overwhelmingly easy for AI to handle. The structure — headings, lists, emphasis — is explicit, so AI understands it accurately and produces it easily. In fact ChatGPT's and Claude's own answers are written in Markdown internally. It is a shared language.

2. It is light and opens anywhere. It is a plain text file, so it is fast and opens in almost any application. Nothing like needing a particular program, the way a Word file does.

3. It stays readable (no lock-in). Even if a particular company's service shuts down, a text file remains readable more or less forever. Your knowledge is not held hostage by a service. Over the long run of accumulating knowledge, this matters decisively.

4. It goes straight into a blog or post. Most publishing platforms work well with Markdown, so what you wrote can be reused directly. Learning and publishing become continuous.

The basic marks (this much is enough)

All you need to learn at first:

# Heading 1
## Heading 2
### Heading 3

- a bullet
- a bullet

**words you want bold**

1. numbered list
2. numbered list

> a quotation

That is enough to write a structured document. This guide itself is written in Markdown.

And above all —

ask the AI to "convert this Word document to Markdown" and it will do it automatically.

You do not even truly need to memorise the marks. Hand over what can be handed over.

Try this

Open a text editor and, imitating the marks above, write five lines of Markdown about what you learned today. Save it as 20260529_markdown-practice.md. That is the first file in your knowledge base.

Chapter 9 summary

• Markdown is a simple way of writing with a few symbols (extension .md)
• Easiest for AI to handle, light, openable anywhere, readable in future
• Only a handful of marks — and the AI will convert for you