This is the 1292nd most frequent Polish word.
korzystania
The Polish word "korzystania" means "using" or "utilization" in English.
The word 'korzystania' is used in its instrumental case form of the noun 'korzystanie', to refer to the action of using. It connects here to 'z internetu', as it is an action involving the internet.
Podczas korzystania z internetu należy zachować ostrożność.
While using the internet, one should exercise caution.
The word 'korzystaniu' appears here in its locative case, used after 'w' to indicate a location in the context of using modern technologies.
Moje doświadczenie w korzystaniu z nowoczesnych technologii jest duże.
My experience in using modern technologies is extensive.
'Korzystanie' in this sentence is in its nominative form, acting as the subject of the sentence and denoting the act of using a phone.