This is the 1215th most frequent Polish word.
lepiej
"Better."
Here, 'lepiej' is used as a comparative adverb suggesting a preferable state between options.
Lepiej być zdrowym niż chorym.
It's better to be healthy than sick.
In this sentence, 'lepiej' functions as an adverbial modifier, indicating improvement in the manner of action (planning).
Powinniśmy lepiej zaplanować naszą podróż.
We should plan our trip better.
This example uses 'lepiej' to express a recommendation or advice about a preferable action.