Taiyi Tianzun is a very important figure in Chinese mythology. He is a god who is believed to have created the universe and all living things. People in China worship him and ask for his help with all sorts of things.
Imagine you are playing with your toys and you want to make a new toy. You might use different materials to create it and put things together in a certain way. This is sort of what Taiyi Tianzun did - he created the world and everything in it.
But Taiyi Tianzun is not just a toy maker, he is also like a boss or a leader. People believed that he made the rules that everyone had to follow. These rules are called "laws of nature". They make sure that everything works the way it is supposed to, like how the sun rises in the morning and sets at night, or how plants grow from seeds.
Sometimes people need help or good luck, so they ask Taiyi Tianzun for his help. They might light incense or make offerings to show their respect and ask for his blessings.
Even though Taiyi Tianzun is a god and people can't see him, they believe that he is always watching over them and taking care of everything in the world.