What is the resolution of how the Grinch stole Christmas?

In "How the Grinch Stole Christmas," the resolution occurs when the Grinch, after stealing all the Whos' Christmas decorations and presents, hears them singing joyfully despite their loss. This realization changes his heart, leading him to return everything he took and join the Whos in their Christmas celebration. Ultimately, he learns that the true spirit of Christmas comes from love and community, rather than material possessions.