After the death of the ancient emperor, did the prince succeed to the throne immediately?

If you have a son, you will generally choose the eldest son to inherit the throne, that is, the queen's son to inherit the throne. If there is no queen, you will also choose the son born to the highest-ranking concubine to inherit the throne. Mothers are more expensive before the succession, and mothers are more expensive after the succession. Of course, this is not absolute, but also depends on who is behind the minister, with high background and great strength. For example, when Huang Taiji died in the Qing Dynasty, there was no prince. At that time, the eldest son, Haug, and Huang Taiji's younger brother, Dourgen, were equal and both had the possibility of succession. But in the end, Bogor, the tenth brother of the imperial concubine, was the most distinguished, but because Dourgen and others supported Fu Lin, the emperor shunzhi and Fu Lin succeeded to the throne.

If the emperor had no sons, such as Song Renzong who died as a princess and had no prince, he chose an heir from the imperial clan as the emperor.