1. If it is the first type, there are eight pure hexagrams, such as the six hexagrams with Quanyang as the dry hexagrams and the six hexagrams with Quanyin as the Kun hexagrams. After crossing, we got a combination of 64 hexagrams, plus 4,096 hexagrams which are changeable, but these are fixed, searchable and memorized.
2. If you ask what you think of the hexagrams after they are arranged, it will be complicated, and I can't make it clear in a few words. You can find relevant information online. Different teachers and students learn from each other, but this is the essence. Commonly used are breaking hexagrams with images, using hexagrams with the world, and shifting spirits to break hexagrams. There are many schools, but there is only one purpose: to test the unknown. If divination is accurate, the accuracy of divination will be higher, but none of them is 100% accurate. If the probability exceeds 70%, it will be terrible, because the cost is very low, basically it doesn't cost money, and it doesn't take long to get an unknown data.