Understand key concepts like tables, records, and fields.
Practice writing queries to retrieve and manipulate data.
Learn about normalization, indexing, and schema design.
PostgreSQL, and SQL Server. Understand their strengths.
Explore MongoDB, Cassandra, and their use cases.
Design schemas that fit your application's needs.
Implement authentication, authorization, and encryption.
Learn about tools like Hadoop, Spark, and data warehouses.