أنشئ حسابًا أو سجّل الدخول للانضمام إلى مجتمعك المهني.
How much experience must be had?
Yes, it depends on area of interest. A participant might prefer to work on field which might not be available as a professional
The two certificates are not replaceable by each other. To begin with one needs professional certificate and by experience one increases professionalism.
