Galicia is a very cool place in Spain where some people feel very proud of living there and they really love their culture and traditions. This feeling of being proud of living in Galicia is called nationalism. It's like when you feel really proud of your family and you want to learn all about where they come from and what they like to do.
Galician nationalists believe that Galicia is a unique place with its own language, history, and traditions that are different from the rest of Spain, so they should have their own government and be more independent. This means they want to make decisions about their own country that are good for their people.
They also feel that it's important to protect their Galician language, which is different from Spanish. Just like you might go to a school to learn how to speak and write properly, some Galician people went to schools to learn the Galician language.
The Galician nationalist movement started a long time ago and it's still a very important part of Galician culture today.