Texas is a huge state with a couple of huge cities that a growing extremely fast.

While it is possible that a rentincrease may be so extreme as to violate the “profiteering in rents” law,37 the new rent being chargedwould have to be completely out of line with comparable rentals.

Look into properties that have room to build another unit, a garage you rent as storage, maybe add a tiny home to the backyard or something.

They are not very investro friendly because they are extremely picky!

The chief economist quoted in this article says that Columbus continues to remain one of the strongest housing markets because of its population and job growth along with its affordability, and adds that, “Columbus homes may seem expensive for people living here, but it’s very affordable compared to other markets...”As a resident and investor, I found this article extremely encouraging, and if you are a RE professional in any capacity within this market, or if you're considering jumping into the Columbus market, you should be encouraged too.

With well & septic, you have to be extremely careful and diligent to ensure tenants do not flush anything improper or allow the plumbing systems in their homes to get backed up in any way.

Indy is a great SFR market but I would be extremely cautious with MF. 

Those seem TINY.

The other reason is I found it extremely difficult to juggle educating myself on real estate while attending Army Flight School training.

No issues renting, the rental market here is extremely robust and you won't have a problem with finding tenants unless you're in the luxury market.SFH/Townhomes tend to hold value better than condos, but ones with associations do tend to hold their value than ones without.