SQl Join Types

Question

Sir, please take look at the following SQL JOINS statements:-

1) select * from tbl_Employee joins tbl_department
 on tbl_Employee.employeeId=tbl_department.employeeId


2) select tbl_Employee.employeeName,tbl_department.departmentName
joins tbl_Employee.employeeId=tbl_department.departmentId


3)select employeeName, departmentName from tbl_Employee
 where departmentName=(select departmentName from tbl_department where departmentId=1)

I am confused of the above SQL joins, confusion of which kind of join statement to use in a joining of tables.

in which of the above code has more perfection than others when using in a complex situation?

which code has most standard?

which of these query is to be accepted in table joining situation. Let me Know.