# XRP Ledger resources

- [XRP Ledger Concepts](/app/xrp-ledger-resources/xrp-ledger-concepts.md)
- [Video: Reserves and Fees on the XRPL](/app/xrp-ledger-resources/xrp-ledger-concepts/reserves-and-fees-on-the-xrpl.md): Reserves and fees on the XRPL - Video 4 of 5
- [About Reserves](/app/xrp-ledger-resources/xrp-ledger-concepts/about-reserves.md): Understanding reserves on the XRP Ledger
- [Payment Channels](/app/xrp-ledger-resources/xrp-ledger-concepts/payment-channels.md): Understanding Payment Channels on the XRPL: A Simple Guide
- [Multi Signature](/app/xrp-ledger-resources/xrp-ledger-concepts/multi-signature.md): Understanding XRPL MultiSignature
- [Understanding fiat currencies](/app/xrp-ledger-resources/xrp-ledger-concepts/understanding-fiat-currencies.md): What is fiat?