If you want to brush up on PML, I suggest you check out my book Lend to Live: Earn Hassle-free, Passive Income in Real Estate with Private Money Lending available on the BiggerPockets book store.

You'll find tons of good info here, I recommend checking out a local meetup or two as they're super helpful to brush shoulders with other folks that have either done what you're doing or are asking the same type of questions. 

Essentially (broad brush strokes from a layman's understanding) what many people don't realize (and I didn't before 3ish years ago) is insurance companies have insurance against their own substantial losses; 'reinsurance'.

I wrap them in tar paper or brush on actual tar or similar substance.

He pivoted to STR projects, rebranded as Techvestor and since then brushed off questions about Scout pads or MBD.

The rest of this nonsense is static.

Replacing old hardware with modern finishes like brushed nickel or matte black can also make a big difference.

Or you could be brushing up on your skills. 

In cities with declining or static populations, property prices are low because there is little demand so little appreciation.

For hardware, go with brushed, nickel or brass gold.