For investing principles and deal analysis, The Book on Rental Property Investing by Brandon Turner is excellent, it covers cash flow, evaluating deals, and basic financing strategies.

Tenants reducing your mortgage principle.

I worked with an eviction attorney to draw up specialized agreement using the principles of an RV park.

Now it's more like flip four, buy one - but the principle is the same.

Jeff, the safest and most scalable plan usually comes down to one principle: don’t trade long-term control for short-term comfort.When you buy properties in cash, you eliminate debt risk but you also eliminate leverage, which is the main engine that accelerates wealth in real estate.

Three Core Principles Every Real Estate Investor Should MasterSuccessful real estate investing isn’t about chasing every deal—it’s about clarity, alignment, and strategy.

Hopefully this can be helpful for anyone looking to learn the basics or refresh their memory :) CONCEPTS1.

Did you confirm the 2% annual management fee is deducted from principle prior to principle being returned? 

I am a strong advocate of those same principles, but the real estate you are targeting cannot realistically absorb types of licensed and insured vendors your desired systems require to be effective. 

A few of the principles I've learned over the years that have contributed to this set up:1.