The process of learning something has the same effect on the brain as exercising our muscles. If we practice exercise regularly, they will increase in size and become stronger. The same thing happens to the brain. By making it work, we change its structure while improving certain functions. Let's talk about the specific processes that occur in our brain when we learn new languages. The first time I heard words in dutch. I decided to study this language and this country in general https://www.amazon.com/Dutch-Frequency-Dictionary-Vocabulary-Dutch-English/dp/9492637340 . I think it's fascinating and beautiful.