The number one book I recommend is the Bible. The Bible is not a book that pushes itself on you. It is a book that relates, informs, warns and saves you from what you do not know. In life today we have so many things pulling for our attention that problems and conflicts get pushed back to be dealt with later. The only thing about that is they are not pushed back problems only grow if not dealt with. The Bible teaches us how to deal with and face each and every problem in our life. Why not give it a try?
The Bible comes from our creator. If you created something you know how best it will work and what will cause it to dysfunction. You would instruct the user of your creation on how to handle your precious merchandise so as to get the best benefit. If the user decides not to follow the instructions the merchandise will malfunction. The user will come back to you angry asking why isn't the merchandise working and you would say I gave you the manual with all the instructions, you have everything you need to fix the merchandise. The user will go home pull out the instruction manual and get to work. The work will take time because of the amount of damage done to it.
This is how we live our lives many times. Things go great we are happy, things are bad we are crying out for help and help is not far from our reach. The Bible has a solution to your every need. Pick it up today and start reading it. If you're unsure where to start I along with many others recommend the Book of John in the new testament.