This is the 2486th most frequent Polish word.
inną
"Another" or "different" (feminine form in accusative or instrumental case).
The word "inną" modifies "książkę" to indicate it is a different choice than another book.
Wybrałem inną książkę do czytania.
I chose a different book to read.
"Inną" describes "drogą," specifying that the route is not the usual or expected one.
Ona poszła inną drogą do szkoły.
She took a different route to school.
The term "inną" is used here to describe "taktykę," signifying that the strategy is an alternative to the current one.