This is the 2290th most frequent Russian word.
ключи
"Keys."
In this sentence, 'ключи' means 'keys' with the context of being physical items that unlock a vehicle.
Я нашёл ключи от машины.
I found the car keys.
Here, 'ключи' is used metaphorically to represent essential aspects or principles.
Эти ключи заботы — самая важная вещь в жизни.
These keys of care are the most important things in life.
Here, 'ключи' refers to physical keys specifically for unlocking an apartment.