Why this lesson exists. The previous lesson drew the line around what a shared knowledge base must not contain. This lesson builds the thing itself: a small, organised set of documents that gives the model (and every new hire) your company's context every time, so nobody has to paste the about page into every conversation again. This is certification part 1.
By the end of this lesson you will be able to write the first three pages of a second brain, because you will have seen what a new starter's first day looks like with and without one, and then written yours.
Two first days
Without a knowledge base. A new account manager starts on Monday. She spends the week asking questions: what do we actually sell, what is the difference between the Business and Enterprise plans, how do we describe ourselves to a housing association versus a training company, why did we stop offering the mobile app, what tone do we use with customers. Each answer comes from a different person, some of them out of date, two of them contradictory. On Friday she writes her first customer email and gets it gently corrected by three colleagues, differently.
With a knowledge base. Same person, same Monday. She is pointed at seven short pages: who we are, what we sell, who we sell to, how we sound, how we work, what we have decided, what has changed. She reads them in an hour. On Tuesday she writes her first customer email, and it is right, because the pages told her the price, the positioning and the tone, and the "what we have decided" page told her why the mobile app is not on offer. The AI tool she uses to draft it had read the same seven pages, so its draft was right too.
Nothing clever happened. Somebody wrote down what everyone already knew, once, in one place.
What a second brain is, and why it works
The term comes from personal productivity, where it means an external store for your own notes. For a business it means the company's shared memory, written down so that both people and AI tools can use it. It works for the reason Lesson 1 gave: the model is only as good as what it can see, and a second brain is a permanent, curated answer to "what should the model see about us?" Point the model at it (attach it, load it into a skill, or connect it as a source) and every conversation starts with a colleague who has read the manual.
A good one is boring. Plain documents, each answering one question, short enough to read in a few minutes, dated, and linked to each other:
- Who we are. Company, founders, mission, what you sell in one paragraph.
- What we sell. Products, plans, prices, what is and is not included.
- Who we sell to. Customer types, the problems they have, the objections they raise, the words they use.
