relational model concept explained
Entity Relationship Diagram (ERD) Tutorial - Part 1
Candidate Key in DBMS (Candidate key, Primary Key, Foreign Key, Alternate Key, Super Key)
Basic Operators in Relational Algebra - GeeksforGeeks
Introduction of 4th and 5th Normal form in DBMS - GeeksforGeeks
Minimum relations satisfying First Normal Form (1NF) - GeeksforGeeks