. - The ultimate house hack, live in the small ADU unit and rent out the two levels of the main house on AirBnb in San Francisco (I would have thought STRs are oversaturated in S.F. but it worked for them and they stay fully booked).

There is a BP book by Heather Blankenship that would be a good place to start - Real Estate Campgrounds.

@Alex Hymanson  you should read the book...Storing Up Profits. 

I have three listings, 1. unit with a pool and hot tub, 2. unit with a hot tub, 3. both units together as a 12 sleeper.Gross monthly income (after booking channel fees) for the first unit over a 7 month period was $7309.Gross monthly income for both units over a 14 month period is $11,297 (after booking channel fees) As a long term rental the combined rent would be in the region of $5500.Is it possible to sell the property based on the income generated by the STR business or would the value always be based on bricks and mortar comps? 

Then you can read a more in-depth book like The Book On Rental Property Investing by Brandon Turner or The Unofficial Guide to Real Estate Investing by Spencer Strauss.2.

BRRRR was easy to win at when all the books were written and when it became popular.

Read books on real estate investing.

Here are some great resources for you to check out: The Book on Estimating Rehab Costs https://www.biggerpockets.com/forums/12/topics/862964-wholes...Wholesaling Calculatorhttps://www.biggerpockets.com/blog/rookie-241?

While podcasts, books, seminars, and websites offer general knowledge, you'll buy a specific property in a specific location, subject to local rules and regulations.

In fact, I just tossed away an amortization book of tables that I've had for almost 30 years, when we were doing some winter cleaning - the lowest rate it went down to was 7%.