Estou aprendendo galego, quero aprender esta lingua porque é a mesma do portugués. (Galician)

Estou a aprender galego, quero aprender esta língua porque é a mesma do português. (Português europeo)

There are some differences and similarities, you can notice also from this phrase. Portuguese and Galician have the same origin, before they were the same language (Galician-Portuguese), but actually they are a little different. 

First notebook entry: Introducing myself

I am learning Galician, I want to learn this language because it's the same as of portuguese.