insert data to multiple table in same time

Question

I need to make multiple insert to multiple table have relation with each other

what i need actually when user click submit

Save the following data

Name,Email,Salary,DistrictId in table Employee

EmployeeId,CourseId in table EmployeeCourse

EmployeeId,LanaguageId,LevelId in table EmployeeLangage

what i write in create function in empcourse controller

 

my code attached with message 

my interface and Relation diagram is