This is the 688th most frequent Bulgarian word.
основните
"Основните" in English means "the main" or "the basic."
Here, "основните" is used as a determiner modifying the noun "цели" (goals), specifying them as the primary or main ones.
Основните цели на проекта са ясно определени.
The main goals of the project are clearly defined.
In this sentence, "основните" describes "принципи" (principles) as being fundamental or key.
Той успя да постигне основните принципи на теорията.
He managed to achieve the main principles of the theory.
The term "основните" is acting as an adjective for "въпроси" (questions), denoting their primary importance.