how to write cursor?

Here's a nice simple example I have given to coworkers to get them going. It iterates through the cursor and then inserts into a new table.

DECLARE @StudentID int, @FirstName varchar, @LastName varchar, @GraduateError int
DECLARE StudentCursor CURSOR FOR
SELECT StudentID, FirstName, LastName
FROM Student

OPEN StudentCursor

    FETCH NEXT FROM StudentCursor INTO @StudentID, @FirstName, @LastName

    WHILE @@FETCH_STATUS = 0
        BEGIN
            BEGIN
                INSERT INTO Graduate(StudentID, FirstName, LastName, AddUser, AddDate)
                VALUES(@StudentID, @FirstName, @LastName, 'administrator', GETDATE())

                SELECT @GraduateError = @@ERROR
                IF @GraduateError <> 0
                    BEGIN
                        PRINT '@GraduateError is ' + ltrim(rtrim(@GraduateError)) + '.'
                    END
                ELSE
                    BEGIN
                        PRINT 'Student Migrated to Graduate --> ' + CAST(@StudentID AS Varchar (20))
                    END

                FETCH NEXT FROM PopulationCursor INTO @StudentID, @FirstName, @LastName
            END
        END
    CLOSE StudentCursor
    DEALLOCATE StudentCursor