Bulgarian lexis means the words that people use when they speak or write in Bulgarian language. Bulgarian is a language that people in Bulgaria speak and write.
Just like you know different words in English language like "cat", "dog", or "happy", people who speak Bulgarian also have words they use to describe things like "котка" for "cat", "куче" for "dog", and "щастлив" for "happy".
Bulgarian lexis also includes phrases or longer words that people use to talk about more complicated things. For example, "компютър" means "computer", "блог" means "blog", and "пътешествие" means "travel".
It's important to remember that different languages have their own unique words and phrases, and understanding Bulgarian lexis can help you communicate better with people who speak Bulgarian.