insert-data-into-multiple-tables-using-one-form in laravel code example

Example: insert data into three tables using single form in laravel 7

students table 
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id(PK, A_I)  |  student_name | nationality

teachers table
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id(PK, A_I)  |  teacher_name |  email

classroom table
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id(PK, A_I)   | date   | teacher_id(FK to teachers.id)  |  student_id(FK to students.id)