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.

• 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.

Ready to build instead of read? Start with the quick start, browse the 24 supported data sources, or try Studio in your browser.