Guides

The ideas, explained.

Three plain-language guides to the concepts behind Second Brain Link — what these terms actually mean, where the tools fall short, and how the data you already own changes the picture. The thread running through all three: models are rented and interchangeable, so the context you own is the part that decides the answer.

• What is a second brain?The personal knowledge system idea, why every second brain starts empty — and how to start yours full, from your own data exports.
• What is an AI brain?AI memory and agent context: why models forget you, live capture vs. archive import, and what a private, local AI brain looks like.
• What is a digital twin of yourself?The platforms already built a model of you. A personal digital twin is that model — owned by you, on your machine, working for you.

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