Basics
XRP Ledger basics: how the ledger works and who runs it
Start here. These pages explain the shared ledger itself: what it records, how a set of independent validators agrees on the next page of it, and how the rules change over time.
Start here
What Is the XRP Ledger? A Plain-English Guide to How It Works
Read this first. Everything else in the section is a closer look at one piece of it.