This is the 14741st most frequent German word.
nützliches
"Useful" or "practical."
The word "nützliche" here is an adjective describing the plural noun "Informationen" as beneficial or practical.
Dieses Buch enthält viele nützliche Informationen.
This book contains many useful pieces of information.
The word "Nützliches" is a substantivized adjective used as a noun, implying 'something useful'.
Hast du irgendetwas Nützliches in der Tasche?
Do you have anything useful in your pocket?
In this context, "nützlichen" is an attributive adjective describing the plural noun "Ratschläge," signifying they were practical and beneficial.