I'm a huge fan of San Antonio as an STR market, but it is, like most "mature" markets, very sensitive about WHAT performs well. 

Be the cheapest and best.

The best protection for you and your investments?

I’ve taken a million classes, read a million books and countless meetups but I know the best way to learn is by doing.

Best of luck, Zack 

The fact that you have already owned and sold a rental property gives you a great experience to start from.In terms of the best place to invest - that is whatever place meets your criteria, goals and investing style.Personally flips have not been working as well for me lately, but when we get the right BRRRR deal those are still working well.

Quote from @John Mason: best to go to fiverr some one can do it for a 100usd in 2 hours Ok

Fairfax county virginia is very different than Montgomery county maryland even though they are right next door to each other and most do business in both. 

First pro is you learn how to be a landlord and to manage properties and this is the best way to get started into real estate investing.

But there's so much here that its best to have a conversation.