YugabyteDB is built on top of RocksDB and has made significant improvements to ensure scalability and node density. In YugabyteDB, each tablet (shard) has its own instance of RocksDB, which limits the size to 10GB by default but allows for automatic splitting if it grows beyond that. This means there's no need to limit data per node, making it suitable for large-scale deployments. The database also provides various resources and support channels for users to learn more about sharding, auto-sharding, and other advanced topics, as well as tutorials and training sessions to get started with YugabyteDB.