"Castro culture" refers to a group of people who lived in northern Spain a long, long time ago, before there were any cars or TV or even the internet. They were called "Castro" because they lived in little villages made of stone and wood that were called "castros".
These people were really good at making things out of metal and were famous for creating beautiful and intricate designs in their tools and jewelry. They also liked to use a special type of soil to make pottery, which they decorated with different colors and patterns.
The Castro people were farmers, which means they spent most of their time growing food and taking care of animals. They were also hunters and gatherers, which means they hunted animals and gathered berries and nuts to eat. They were really good at farming and had lots of crops like wheat, corn, and beans.
The Castro people had a really cool way of living together in their castros. They all helped each other out and shared things like food and tools. They also had a leader who made decisions for the whole village, but everyone got to talk about what they thought was best.
The Castro people were really important to the history of Spain because they were the first people to live there and left behind lots of cool things for us to look at and learn about today!