This is the 1165th most frequent Russian word.
будущих
"Будущих" means "of future" or "future (plural, genitive case)" in English.
In this sentence, 'будущих' is used as an adjective describing 'профессий,' emphasizing that the professions are in the future.
Студенты будущих профессий должны хорошо готовиться.
Students of future professions should prepare well.
Here, 'будущих' describes 'выходных,' referring to the weekends that are yet to come.
Мы планируем поездку в парк в течение будущих выходных.
We are planning a trip to the park during the future weekends.
In this example, 'будущих' modifies 'лет,' indicating years in the future.