Difference between Has One, Has Many, BelongsToMany

One to one(hasOne) relationship: A user has(can have) one profile. So, A profile belongs to one user.

Laravel Has Many Through Relationship Explained with Example - DEV Community

What exactly are UUIDs and how are they so Unique?

Active Record Associations — Ruby on Rails Guides

What exactly are UUIDs and how are they so Unique?

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Have you tried to map your universe?

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Has Many And Belongs To Many

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Sequelize associations: n:m mapping

Difference between Has One, Has Many, BelongsToMany