It's pretty popular in the rent by the room model I think 

/European cities for innovativemunicipal problem solving (Cities of Service, 2018)• No. 4 best city for traffic (CarRentals.com 2019)• No. 4 best large city for starting a business(WalletHub.com 2017)• No. 5 among America’s Best Small Cities (BestCities.org 2019)• No. 3 most popular city for extremely active millennials(ActiveNetwork.com 2018)• No. 1 Broken Arrow ranked Most Livable Small City in the U.S.

Groups like AZREIA (Arizona Real Estate Investors Association) are popular because they attract both new and seasoned investors, plus lenders, agents, property managers, and contractors.• Networking with investor-focused agentsEven before you’re ready to buy, connecting with an agent who works with investors can give you a ton of market insight — especially on which submarkets still cash flow.• BiggerPockets local threads and PHX Facebook groupsThere are active Phoenix-specific groups where local investors post deals, contractors, and market updates.

It is the most popular software in the industry, and most Tax Preparers are familiar with it, which makes tax season easier.However, many on the forums will advise against QBO.

PadSplit / co-living are just now becoming popular around this area but the problem is determining the rents so I can perform my underwriting accurately.

Learn the neighborhood market, local rents, common or most popular or highest NOI rent style STR, LTR, MTR - Co-living etc. 

The rare exceptions to selling for appreciation harvesting too pyramid is when the asset has a special factor to it's specific positioning, such as water-front or something similarly special and very long enduring to it's placement.

Not very popular among nurses in my area.

That's probably why wholesaling is such a popular question in the BP forums - no/low capital and no licensing.

I have seen tiny home investing becoming quite popular recently!