Polska z Duolingo

Jestem Julia,  mam 22 lat i pochodzę z Brazylii, z Rio de Janeiro. Ja Mam brązowe włosy i oczy. Jestem nową dziewczyną i lubię uczyć się jezyków. Mówie po portugalsku, angielsku, niemiecku, trochę po włosku i troszeczkę po francusku i po polsku. Polska gramatyka jest bardzo trudna!! Nie rozumiem jej.

Words I'm learning:
- Śniadanie ex: Na śniadanie jem jabłko, mleko i chleb. (At breakfast I eat an apple, milk and bread)
- Obiad ex: Na obiad jesz jajko. (At lunch you eat an egg)
- Stary ex: To są starzy ludzie (Those are old people)
- Mały ex: My mamy małe dziecko (We have a small kid)
- Duży ex: To jest duży dom (This is a big house)
- lubić ex: Nie lubię tamtego mężczyny (I don't like that man)
- Zupy ex: Oni nie lubią zupy (They don't like soup)
- Kawa ex: Ona pije kawę (she drinks coffee)
- Koszuli ex: Ta koszula jest nowa. (That shirt is new)
- widzieć ex: Nie widzę tutaj herbaty (I don't see any tea here)
(...) and much more that I won't remember right now.

I came with the idea of learning polish a few years ago, maybe in 2015 while watching a volleyball match live in Rio (never mind, I also don't know why) but I never took it further in my life. I always learned 2 or 5 words and gave up on it, but now with Duolingo I'm trying to make it more serious, it's been 5 days since I began with it, I believe. My goal is not to be fluent, but just be able to communicate basic things with native speakers. Learning languages is amazing, so why not?!

Of course I always make a lot of mistakes when it comes to declension, so I appreciate your help very much. I have already been suffering for the last three years with german four declensions (even though we only use 3) now I can't even imagine how challenging is it to learn SEVEN DECLENSIONS. Polish is definetly not for beginners!! (if you feel in the mood of translating also what I wrote in english I'd be forever grateful. Dziękuje!)