How to create entity correctly? [EF CORE]

public sealed record WorkingTask: BaseEntity
{
    public required string Identity {get;set;}
    public IReadOnlyList<RequiredQualifications>? RequiredQualifications { get; init; }
}

public class RequiredQualifications
{
    public string? QualificationId { get; set; }
    public byte? Degree { get; set; }
}

RequiredQualifications

public class RequiredQualifications
{
    public Guid WorkingTaskId {get;set;}
    public string? QualificationId { get; set; }
    public byte? Degree { get; set; }
}