2. If you return your hukou to your original place, tell the school or the school to register, and the school will give you a registration card and a hukou transfer card. You can go to the personnel department and the household registration to transfer the card to the police station and return to your original place. If the registered permanent residence returns to the original place, I suggest you return the file to the original place. Generally speaking, there are few separate documents, mainly for fear that it will be inconvenient to handle them when needed in the future.
3. The registered permanent residence and files are not in the company, which has no influence on the development of the company. If you stay in the company, you will need to transfer registered permanent residence and files in the future, which is more troublesome.
4. Your senior is actually a black household with an account in his hand. You should never learn from them, you will get into trouble. I suggest you handle it with caution!
I have been engaged in related work, so I suggest you take my advice. Good luck.