This is the 773rd most frequent Russian word.
будущее
The future.
Here, 'будущее' is used as a noun meaning 'future' to express a general concept or ideal regarding upcoming times.
Я верю в светлое будущее.
I believe in a bright future.
In this sentence, 'в будущем' is a standard phrase meaning 'in the future', referring to a specific time period to come.
В будущем я планирую много путешествовать.
In the future, I plan to travel a lot.
Here, 'о будущем' signifies 'about the future', reflecting on events or conditions that have not yet occurred.