Some brothers are really funny. When they add me as a friend and pull me into a group, the first thing they say is, "How did you solve the XXX problem?" Do I have any obligation to provide free consulting? It turns out that even for a secondary purchase, consulting me about the intelligent computing market costs at least three thousand per session. You come in and ask, "Where is Huawei's 5nm chip being produced?" Such a core question, how can I answer that? How can I possibly answer? I still suggest you take a left turn and check out the teachers' arbitrage tutorials. Those are free and will give you peace of mind.