1.Charlotte spinned some webs with great words such as good pig and terrific to characterize Wilbur as a different pig that deserves to live better. This action attracted many people in town and brought the homers benefits and visitors. And the homers realized that the pig need to be cherished. This is the whole idea.
2.For the first time Charlotte made the web, I would think it was a miracle, because it is unusual to see words on a natrual web and the odd of this incident happening is very tiny. I don't understand why it happens and I find no way to explain it, so it is our instinct to regard the mystery that I cannot explain as a miracle or a coincidence . But if this happened again, I would doubt whether this web is artificial or let some scientists study what's wrong with the spider.