geeksforgeeks.org
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GeeksforGeeks is a programming and computer science education site that provides tutorials, articles, and practice problems on a wide range of topics, including databases, SQL, and database design concepts such as normalization and ER modeling.
More resources on Database Design
datacamp.com
DataCamp is an online learning platform for data science and analytics offering interactive, browser-based courses and tracks. It features SQL and database-related content, including hands-on coding exercises, guided projects, and assessments to practice querying, data modeling, and database design concepts.
Database Design
Coursera course: Relational Database Design
vertabelo.com
Vertabelo is an online database modeling tool and educational resource offering ER diagrams, data modeling tutorials, and guidance on database design and SQL generation.