None! Whether or not you’re absolutely new to the job subject or have had some publicity, a Google Vocation Certification is the proper method in your case.?? ???? ?? ?????, ?? ????????????? ??? ??????? ????? ??? ?????????? ??????? ??? ?? ?????????? ??????????? ??? ?? ??? ?? ?????????? ??????? ?? ?????????? ??? ???????, ?? ??????????? ?? ????????