Since he didn’t seem anything like whatI thought of as a “super sales personality”, I asked him how he found such success.

Yes, a lot of personal finance people preach the rent option, but house hacking is almost always superior. 

It also depends on your price point and budget. because this is going to be your personal residence, at this point, I would just keep aware of city news and developments, and neighborhood pockets.

I personally have no interest in buying my own...

They can and often will say 'no' but if you can just get a 'yes' on a single digit fixed rate you're probably better off than any personal or consolidation loan you may get.

I suggest to make deep research about the location and risk or ask experts personally before take actions. 

I do a lot of seller financing and personally keep track of it all myself but it can be a huge pain. 

If anybody has any personal experience or any good books/blogs, I’d love to hear about them – thanks!!

None of that matters because the algorithm and pacing of the sites and their own personal directives change faster than the speed of light.

Although a DSCR is lenient on your personal income, they will still require a relatively clean appraisal.