- Read numerous biggerpockets posts, podcasts, youtube channels etc

There are numerous books you can buy here from seasoned, successful, knowledgeable investors like @Brandon Turner @David Greene @J Scott @Joshua Dorkin and plenty more professional.

To keep the flowery explanations to a minimum I will just segment the deal as the hosts do so wonderfully on the "Deal Deep Dive."

There are numerous pre-recorded webinars to watch as well as articles and books to read.

Thanks for the explanation Kyle.

It sounds like they're using a contract that they wrote, and one page won't cover all the numerous issues that can come up in a RE transaction.But there are ways to protect yourself - the inspection is a good start, also get leases and estoppel letters if that 3rd unit is occupied.

@Avery HeilbronThanks for the detailed explanation Avery.

With that said, if you continue to rent you will have numerous tenants.   

Here's a recent one that suggests PenFed: https://www.biggerpockets.com/forums/52/topics/897411-need-a-line-of-credit-on-a-non-owner-occupied-rentalAnd another one from a few days ago that suggests TD Bank (and also mentions PenFed and US Bank): https://www.biggerpockets.com/forums/52/topics/898504-td-bank-heloc-investment-propertyAnd there's numerous lenders listed in this post from a couple months ago:https://www.biggerpockets.com/forums/49/topics/879963-helocs-on-investment-propertiesYou'll just need to call around. 

I’ve bought numerous properties that I’ve never been inside, but I buy them at about 10% of appraisal from what I can see of the property.