Tudigong is a type of Chinese god or spirit who is believed to take care of a particular place or piece of land. Imagine if you had a special toy that you really loved and you took care of it really well, making sure it was always clean and safe. Tudigong is like that, but instead of a toy, he takes care of a whole area or neighborhood.
People in China often pray to Tudigong to ask for his help in keeping their area safe and prosperous. They might leave offerings of food or burn incense as a way of showing their respect for Tudigong.
Sometimes, people even build temples or shrines to Tudigong in order to honor him and give him a special place to stay. These shrines might have statues or paintings of Tudigong, and people might come to the shrine to ask for his help or to thank him for the good things that have happened in their area.
So basically, Tudigong is like a special friend who takes care of a particular place, and people like to say "thank you" to him in different ways to show their love and appreciation.