This is the 4581st most frequent Japanese word.
役立ち
Usefulness; utility.
The word '役立ち' in this sentence is used as a verb indicating the utility or usefulness of a tool.
このツールは非常に役立ちます。
This tool is very useful.
In this context, '役立ち' describes the function or helpfulness of advice in fulfilling a particular purpose.
彼女の助言が役立ちました。
Her advice was helpful.
Here, '役立ち' illustrates that something may be valuable or helpful in a situation if applied appropriately.