You can only deduct it against other investment properties if the loan is used for buying them.Also a very good point that you may not be able to itemize in 2018 anyway, whether your loan interest is deductible or not. 2017 numbers do not matter much, because the standard deduction doubles for 2018, and there's a good chance it may be better than itemizing.

I am considering to get my Appraiser Trainee license, are there any schools or providers which provide online coursework?

The manufacturer Pergo has an online installation guide in .pdf form that details how to do this well.

I've definitely considered some type of hard money, although my thinking was to use a FHA or conventional for that matter to leave myself with 2 exit strategies after the rehab.

Gist it wouldn’t matter but 1LT Gist would.

Believe me, title insurance matters to people who buy cash too!

I'm wondering if any of the online services can do it cheaper.

@George FryeCurious by what you mean when you say “popular again”I agree with most that it’s not worth time or effort and trainings are ramping up as many jurisdictions have tax sales coming up in August and the fall and it’s the ways for “guru’s” to start advertising training which for this 99.9% can be found free online and as others mentioned it’s not worth the chase.

Is there a quick screen rule of thumb that investors use to efficiently screen BRRRR opportunities or is it a matter of literally walking hundreds of properties to determine viability as a BRRRR investment? 

I would recommend utilizing the free landlord software that is out there that can provide you with rent estimates for your area, market syndication and online applications/screening.