I think understanding that “relation” means the relationships of attributes to a primary key is a crucial, foundational concept. Without it, you can’t properly

I think understanding that “relation” means the relationships of attributes to a primary key is a crucial, foundational concept. Without it, you can’t properly understand a concept like normalization, why it arises, and when it applies. You can’t even fully grasp the scope of “data corruption” (most developers have an extremely poor understanding of how broad the notion of corruption is in databases).