link candidat table with user table

its best for you to identify which relationship each model has with each other.

• anyone that needs to login needs to be a User
• if aUsercan also be a Candidate, then in your Candidatemodel you will want to add a user_id and define hasOne relationship User hasOne Candidate.
• User can have many roles, and Role can have many User so you want to define a belongsToMany relationship both ways between those models.

depending on the complexity of your Role its best to assign Permissions to Role with a package such as https://github.com/spatie/laravel-permission