This article provides a beginner's guide to using Apache Cassandra, a highly scalable distributed database system. It covers installation, creating keyspaces and column families, inserting data, querying data, and the use of secondary indexes. The Cassandra Query Language (CQL) is introduced as a SQL-like language for managing objects in Cassandra. The article also provides resources for further learning about Cassandra architecture, CQL, and multi-node cluster setup.