What Zhao Hai was telling che Xiaoliang were the most basic things of a botanist. If they were in the soul world, they would know these things as soon as they started learning. However, in the spiritual weapon world, there was no botanist profession. Hence, Zhao Hai wanted to teach che Xiaoliang the basics.
After Zhao Hai finished explaining the basics, he said to che Xiaoliang,"Liang, what I've told you are the most basic things. You have to remember them and never forget them, understand?"
Che Xiaoliang immediately nodded. He was not stupid, in fact, he was very smart. Although Zhao Hai had said a lot, he still remembered everything.