First, do you pay insurance? Don't go unless you pay.
Second, don't even go to lunch with a meat dish. One is that the strength of such a unit is not good, and the other is that the boss is not good to the employees.
Third, the monthly salary is clear. If you default, you won't go.
Fourth, the reimbursement system. If you can't get the approval for a long time, or you can't get the money for a long time, that's not good. On the other hand, if it is too easy, there is a problem.
Fifth, look at the boss's character and car. I can see what kind of boss you are following.
6. Observe your boss.
Find out whether people in the same position as you have been promoted or left.
That's all I can think of for the time being. I hope I can help you.