Important REI concepts for Beginners

[Alonso Fernandez Maldonado]

Hi everyone, my name is Alonso and I'm brand new to the real estate investment world. I just finished reading "The Ultimate Beginners Guide to REI" book and it suggested getting familiar with important real estate investing concepts ie: 70% ARV rule. I was wondering if anyone can recommend somewhere to find all of these concepts for me to study, so I don't miss any important ones. If there isn't a specific place to find all of them, could someone list them and I'll do the research on what each one means?

Thank you, guys:)