Also, I was thinking about it and I think if you were going to make shared amenities (like fire pit) you probably would be very successful doing that strategy I mentioned for larger listings.For big dates I would have one listing that is both the primary and ADU that sleeps 12+, or whatever the number is, and then you can have the ADU and primary again as separate listings for the rest of time. 

I don't expect to know everything by then, but I hope to develop a basic strategy that prevents me from making the most common and costly mistakes that a newbie can make.

For many it could be a decent strategy to invest their money back into their property.Its the same thing for doing a renovation.

Heloc’s are best utilized with a short term strategy, ie flx and flip, to BRRRR, etc.

I don't believe "waiting it out" is an effective strategy.

You can only sell it to landlords using the rent by room strategy.

Both sound strategies. 

@Treza Edwards "I am reading the Rental Property Investing book and implementing the method that focuses on cash flow and that strategy states you need to have $300 cash flow per month, per property.

I think that strategy works best in higher areas or mid term rentals near major employers.  

The strategy may change, but every market can work.