Certificate

Yes, you can.
Indira Gandhi National Open University. Symbiosis Distance MBA. Annamalai University Distance MBA. ICFAI Distance MBA. Sikkim Manipal University. Panjab University Distance MBA. Acharya Nagarjuna University Distance MBA. JIWAJI University Distance MBA.

It is not valuable. But, nevertheless, it is still accepted for government jobs.

That might be minimum qualification, obviously Bachelor's is much more higher than a certificate course in terms of academics.

Yes, you should ensure that the college or institution has proper accreditation with any government bodies.

It's good if you go with Outbound sales and outbound marketing certification.

Hello,
For sales and marketing- Inbound sales and Inbound marketing certification is best fit and you may also go with outbound sales and outbound marketing. For Business Operations-Block chain is the best certification.

It's good to have a decent knowledge of the courses taught in classes but what happens if in a job interview there is a tie between two guys and of them one is who had knowledge of supposedly, MATLAB (or some other platform with a decent coding) or say has good knowledge of Any cad Software, that too certified from a good and reputed place. I think you get the point. Ever heard, "All dots are connected". See, the technical knowledge apart from the one that is taught in the mainstream class shall definitely be helpful in every field, be it research or job perspective.