What does it mean that the main star of the first house falls into the eighth house? Seek an explanation

If it is about western astrology, then this sentence means: the ruler of the astrolabe (the ruler of the first house) falls in the eighth house of the astrolabe.

For example, if the rising sign in the astrolabe is Libra, the rising sign is actually the first sign in the first house, and the ruler of Libra is Venus, which falls in the eighth house of the astrolabe, then it is in line with the situation that the main star of the first house falls in the eighth house.

As for what this situation specifically said, you can Baidu. There are many explanations on the Internet. It is recommended to take the essence and discard the dross, not to believe it all. Personally, I think it is most important for the owner of this situation to establish a correct, positive and kind outlook on life ~