This walkthrough covers the guestbook demo DApp developed on the Stellar blockchain, highlighting the functionalities and architecture of the application. The guestbook allows users to read and write messages, with authentication handled via passkeys for a wallet-less experience. The smart contracts include functions for writing, editing, and reading messages, using utility functions to store data on-chain. Additionally, the video details the TypeScript bindings which connect the front end to smart contracts, enabling smooth interaction. The implementation of passkeys replaces traditional wallets, enabling transactions and login with biometric authentication. This content is relevant to Stellar enthusiasts and developers, demonstrating its potential for creating user-friendly, secure decentralized applications.