> ## Documentation Index > Fetch the complete documentation index at: https://docs.pond.li/llms.txt > Use this file to discover all available pages before exploring further. # Pond Docs > Learn how to use Pond — a tool for understanding. Welcome to the Pond documentation. Start with [What is Pond?](/introduction) to understand the vision, or jump straight into the core concepts below. When you first log in, Pond comes with **sample data and a guided walkthrough** to help you get oriented. You can remove the sample data or replay the walkthrough at any time from the app **Sidebar**. ## Start Here Pond runs on three nouns. Everything else is behaviour you'll meet in the app before you need a name for it. The vision behind Pond and how to think about it. The passages you mark as significant in the sources you bring in. Working spaces where Fragments are related, organised, and developed over time. Your writing surface — prose, embedded Fragments, and agent contributions. ## Going Deeper The sources you bring into Pond — articles, PDFs, videos, notes, and images. The links that form when you relate Fragments — the layer Pond's intelligent features navigate. How Pond navigates your relational layer to suggest Fragments and develop Threads. How Pond remembers your paths through the archive, so you can pick up where you left off. Interpret what you read through the lens of your Threads and library. Simple, volume-based tiers. Every plan gets the full Pond experience. ## Coming Soon Programmatic access to Pond. Bring together Threads exploring a greater theme. Pond proactively discovers Threads running through your collections.