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Learn the language of personal knowledge
Short, source-attributed definitions for the concepts that show up around capture tools, knowledge bases, and personal handbooks.
- Knowledge management
What is a second brain? Definition, methods, and tools
A second brain is an external system for capturing, organizing, and reusing the information you encounter. Definition, four-step method, and how it actually works.
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What is a personal knowledge base? How PKBs work in 2026
A personal knowledge base is a private collection of notes, references, and lessons you maintain so you can find and reuse what you already know. Definition, structure, and tools.
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What is a personal handbook? A modern alternative to notes
A personal handbook is a curated, reusable collection of lessons drawn from your daily inputs. Not a journal, not a bookmark folder. Definition, structure, and starter template.
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What is spaced repetition? Science, schedules, and tools
Spaced repetition is a study technique that reviews material at increasing intervals just before forgetting. Definition, the forgetting curve, schedules, and tools that use it.
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What is a zettelkasten? The note-linking method, explained
A zettelkasten is a slip-box system for atomic, linked notes that compound over time. History, the four note types, modern digital implementations, and when it fits.
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