I have a Samsung Galaxy smt110 Tablet, how can I delete my cached files?

[AC Question]

But dont want to lose my books, so if I delete cached files will imlose my books?

 

[B. Diddy]

Welcome to Android Central! Cached data is always just temporary data, so clearing the cache wouldn't erase the book from your online library. Which cache are you talking about--the app cache for your book app, or the system cache partition?