This is the 11644th most frequent Polish word.
kluczem
"Kluczem" means "with the key" or "key" in instrumental case in Polish.
In this sentence, 'kluczem' is used metaphorically to signify 'the key' as an important element or factor for achieving success.
Uczę się nowych metod kluczem do sukcesu.
I learn new methods; the key to success.
Here, 'kluczem' refers to a physical key used for unlocking doors.
Otworzyłem drzwi kluczem.
I opened the door with a key.
In this usage, 'kluczem' refers to a principle or method adopted to solve a problem.