Many CS professors at institutions like Stanford, MIT, or Georgia Tech post their customized Elmasri/Navathe slides publicly.

Recent editions (7th) include slides on NoSQL databases (like MongoDB), Big Data processing (MapReduce/Hadoop), and XML/Web data. Fundamentals of Database system | PPT - Slideshare

Chapter 3: Entity-Relationship (ER) Model – Detailed walkthrough of conceptual data modeling using the ER model. :

The relational model is the most widely used data model in database systems. It represents data as a set of relations (tables) with well-defined structures. Each relation has a set of attributes (columns) and a set of tuples (rows). The relational model supports various operations, including:

Chapter 2: Database System Concepts and Architecture – Focuses on data models, schemas, and instances.

Many Computer Science departments publicly host slides based on this specific textbook. You can find them by searching Google using specific file type operators.