This is the 399th most frequent Slovenian word.
veliko
"Veliko" means "a lot" or "many" in English.
'Veliko' is used as an adverb indicating a considerable quantity associated with 'zanimivosti' (attractions).
To mesto ima veliko zanimivosti.
This city has many attractions.
In this sentence, 'veliko' again acts as an adverb expressing a great quantity, this time referring to 'uspeha' (success).
Želim si veliko uspeha v življenju.
I wish for much success in life.
Here, 'veliko' functions as an adverb meaning 'a lot' or 'many', describing the quantity of 'ljudi' (people).