The one you can scale.I know successful business owners in the fitness industry, tanning salons, real estate, window coverings, maintenance, billboard, ATMs, etc.Generally, I would be skeptical of jumping into a business based on YouTube videos hosted by and featuring people that are likely primarily trying to sell you their respective courses.Small businesses can indeed be great investments, but they are hard.  

I've been around the tech industry since the mid-1990's so when Bitcoin first started to gain a little traction I had a lot of tech friends who would try to evangelize to me about it.  

Conventional loans are available all day long for rental properties, so long as the property is residential (1-4 unit) and not commercial (5+ units, retail, industrial, etc).

Where these numbers are found, there is a very high rate of rent actually being paid.We have over a dozen Fortune 500 companies just in Metro Detroit with huge Healthcare, Auto, and mortgage industry National footprints.

It is very common in this industry since there is a lack of regulations on business purpose loans. 

@Liam AlvarezI’ll be a contrarian here.After 46 years in the industry, both as a SFR broker & investor and now as a MF operator with over 1000 units as a general partner…..The best market to invest in is the market YOU KNOW BEST.

Where these numbers are found, there is a very high rate of rent actually being paid.We have over a dozen Fortune 500 companies just in Metro Detroit with huge Healthcare, Auto, and mortgage industry National footprints.

Labor shortages have hit that industry just like everything else, so finding reliable, trustworthy, quality cleaners is a challenge everyone is facing.

A lot of the best investors I see have come from industries on the tangent.

My goal is to scale up over the next few years and add another 10-20 doors.I ran across someone that is saying they are building quadplexes in the same town in Texas as my current rentals there, so I have some support system there.High level this is the idea on the deal:4 units constructed as 2 duplexes on one parcel.1250sqf 3/2/1 units$650k sale price, CME is $820k according to builder, will have a independent CME done if/as I move forward.Rent per unit is $1750 based on the other quad in the developmentBest guess at this point is about $16k/year cash flow at a 9.5% cap rate.Builder is a sister company of a established company in a related industry that has done "some" builds before but not a lot.