This is the 399th most frequent Slovenian word.
veliko
"Veliko" means "a lot" or "many" in English.
Here, 'veliko' functions as an adverb meaning 'a lot' or 'many', describing the quantity of 'ljudi' (people).
Veliko ljudi je prišlo na koncert.
A lot of people came to the concert.
'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).