What's the difference between the books?

[Emily Cole]

Hello! Quick question for anyone who will know. 

What's the difference between the book "How to Invest In Real Estate: The Ultimate Beginners Guide to Getting Started" and the book "The Book On Rental Property Investing"? Does the new one replace the old one, or are they different altogether? 

I'm trying to get into the real estate investing game and am looking for a comprehensive guide/walk-through on different investing methods. I'll eventually be getting both (and more) but my question is really which one should I start with?

Thank you very much! :)