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I can't clearly understand the question but I hope this satisfies your question.
The MOST important law for any HR professional is the Labor Law associated on the country that you are employed in. Every HR should know it by heart, and should always be updated if there are changes with the labor laws, that's why you should engage yourself with current affairs in relation to labor and employment because all companies are required to follow the labor law of the land.
As to policies, regulations and procedures, you should refer to your own company manual, which is also co-authored by the HR department, and co-signed and approved by the MD or CEO or senior level board members. Every company will have a set of policies and guidelines which most of it comprises with the labor laws. (Companies cannot make their own laws inside the office if it is in complete violation of the country's labor laws). In order for you to attain best practices, it is imperative that you practice what you preach. If as HR, you are enforcing the rules of the company, it is also best if you will follow it and be an example to the other employees in the company.
