There are many advantages:
1. You get a lot of knowledge... Even more than you were expecting.
2. The work is easy as if you would use the net then it would take time checking every site to get all of the information.
3. In using books, you just need to select one book and there you get all your required information packed in a basket! (Lol)
4. You save time.
5. You save electricity
And many more...