The most recognized certification, in my opinion, is the CRCM. If a program is too easy, it isn't worth it. The CRCM is NOT available online and it isn't easy.
I don't know of any certifications available online. And I would recommend looking for one of value and respect as well as being recognized nationally. Good luck.
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AndyZ CRCM
My opinions are not necessarily my employers.
R+R-R=R+R
Rules and Regs minus Relationships equals Resentment and Rebellion. John Maxwell