Lithuanian mythology is like a big book of stories and legends that the people of Lithuania used to believe a long, long time ago. It's kind of like how you have favorite stories with heroes and villains, except these stories are about gods and goddesses, mythical creatures, and magical powers.
In Lithuanian mythology, there is a supreme god named Perkūnas who is in charge of thunder and lightning. He is very powerful and even has a magical weapon called a thunderbolt that he can use to defeat his enemies. Then there is a goddess named Laima who is in charge of destiny and fate. She decides what's going to happen in the future and sometimes even helps people out.
There are also creatures like dragons, giants, and witches that live in this mythology. One of the most famous creatures is the Vilnius Iron Wolf. The legend goes that a prince named Gediminas once had a dream where he saw a huge wolf made of iron howling on top of a hill. A wise man told him that this meant he would build a great city on that hill, and he did! That's how the city of Vilnius, the capital of Lithuania, was founded.
Overall, Lithuanian mythology is a collection of amazing stories that teach us about teamwork, bravery, and the power of believing in something greater than ourselves.