To dream of a book on a specific subject means you have knowledge of that subject area. This is particularly the case when you have the book in your hands in the dream, and even more so when it is not a book that you are familiar with, or is not available in reality.
To dream of many books or a library means you have a counseling ability. In this case the books represent a depth of knowledge or wisdom that you have. This depth of knowledge can be used to help others deepen their knowledge of themselves. You have this counseling ability regardless of whether you have had formal training. Note that many countries require you to have a formal qualification before practicing counseling officially under the counselor banner.
Books on a table again mean you have a counseling ability (see many books above). However, in this case you are being told that you are responsible for developing this ability to a level where you can formally practice it.
A book’s binding is about karma you are bound to.
A book’s spine is about your spine. Threads in the spine would indicate nerves in your spine.
