Hello G, good Mmorning! Hello, good morning!

In English the only words that have capital/big letters are proper nouns (like names of people/companies or places).

I'm so happy because today is Mmy Bbirthday! I'm so happy because today is my birthday!

Happy birthday :)

I'm here forto say that I give aam having breakfast in the Hhotel in my city. I'm here to say that I am having breakfast in the hotel in my city.