1) Rich Dad Poor Dad (almost every investor started with this one)
2) The Book on Managing Rental Properties by Brandon Turner (This book was pivotal after my initial purchase, it has made and saved me more money than any other book)
3) Set For Life by Scott Trench (provides you with a detailed description of how to create your "financial runway", I have tried to model my investing career off of this book.)
4) BRRRR by David Greene (provides detailed description of how to use the 2nd best strategy in Real Estate (house hacking is #1))
5) Long Distance Real Estate Investing by David Greene (Provides detail description of how to invest in Real Estate if you live in an expensive Market
6) The 10x Rule by Grant Cardone (mindset/motivational)
7) The Book on Estimating Rehab Costs by Jay Scott (provides detailed description on handling what I find the most difficult aspect of REI)
That is my rank order for the most influential books that I have read. A lot of those books are books from this Website. Most of the information can be found on this forum or in the podcast in some way. I think that education is the first step and these books will provide you with a pseudo bachelor degree in real estate investing at the very least. I hope that this helps.