Difference between CCROI and ROI and how to use them

[Mohammad Mahir Khan]

So I have just recently been interested Real Estate investing. Currently I am an accounting major at a university trying to get my bachelors and masters in accounting and my long term goal is to get my cpa and eventually do real estate investing full time. 

This website is very helpful but the vast amount of information that is here is starting to become a bit overwhelming and confusing. I actually have two questions:

1. What things should a beginner learn first in order to get a good understanding of all of the basics of Real Estate investing?

2. What is the difference exactly between Cash on Cash Return and Return on investment and how can I use these two things to better analyze properties?

Thank you in advance for any advice that you may give!