For instance, I read that a book is "worth reading" meaning this book is good to spend time in it, but what I ask is if is there a rule that put worth always before, or can we put it after the word. I don't know but it sounds better to say confident worth that worth confident. Maybe none of them are correct because confident is an adjective. DO you know the rule applying worth? Confident worth is for "something you can trust in" :shock:
Your confusion is due to worth being both a noun and an intransitive verb.
The worth of something is about its value, in money, quality, merit or importance. So a book is worth reading because it is a good read, interesting read or simply enjoyable.
The worth of this book lies in its subtle use of words.
The real worth of this book............
Confident is not used with worth as you imply, but:
I am confident about the worth of this book, and,
The worth of this book is in the confidence it gives to the reader.