This week's book giveaway is in the Java in General forum. We're giving away four copies of Helidon Revealed: A Practical Guide to Oracle’s Microservices Framework and have Michael Redlich on-line! See this thread for details.
This sound sodd. The Hibernate web site has very extensive introductions and tutorials covering all aspects of its use. This includes ready-to-tun code examples that start at the very beginning. Are you sure you have seen all those?
Don't go to "many sites", go to hibernate.org. If you still have specific questions then, post them here. Nobody is going to walk you through something that is so well documented elsewhere.
It would be better if you would ask more specific questions than just "I don't get it". Do you understand what Hibernate is and what it's purpose is? Or are there specific aspects that you don't understand?
Thats depending on what you like to achieve...
If you like to build the tutorials, you need to add the libraries to the build path.
I'm sorry if I'm wrong but I believe you need to get a better understanding of Java and/or Databases first.