What are the legal and ethical duties and responsibilities that Indian corporations have towards their employees, and are these rules the same for all the Indian companies as well as for foreign companies that are established in India?

And if the corporations fail to meet these obligations, what penalties or consequences do they face?

Can you tell me what the specific steps or things I need to know before selecting the best health insurance plan for me are? How to select the best and affordable health insurance?
And one more thing, if my insurance is already covered by my company, then can I buy another separate personal health insurance policy for myself?