You see people add basement "rentals" fairly consistently.  

For illustration purposes a quad consisting of all one bed one bath units will cost a lot less to build than a quad consisting of all 3 bed 3 bath units.....

Learn how to hit singles consistently.

I have received my dividends quarterly, and their communication is great.

My team and I dive deep into market analytics to provide our clients with comprehensive reports that guide them in making informed, data-driven choices when entering new markets and setting up their vacation rentals.Moreover, we prioritize a human-centric approach in our designs, ensuring that not only are the aesthetics on point, but the functionality and comfort lead to happy guests and consistently stellar reviews.

I think just reading books, being active on the BP forums and consistently attending your local REIA will be more effective and far cheaper. 

Escrow companies that are responsive and communicate well.

The plus side is once you get going it's very beneficial as you should have consistent bookings.

My strategy is to have consistent monthly payments and I'm okay with putting off renovating. 

My realtor is a super communicator which won the bid when ours was basically the same as the other party’s.