You own rental homes, not gun stores or high risk sporting events where accidents happen frequently.

The short answer is that yes, certain categories of retail such as apparel, consumer electronics and department stores, which are vulnerable to eCommerce, have been hit harder than others.  

Again, the BiggerPockets store has some books for this or you can learn by watching podcasts, reading blogs, and interacting on the forum.

I got 2 yr old appliances cheap. storing them in my garage.

Also, I recommend finding a good real estate investment calculator (just search in the app store). 

The local grocery store used to be nice and clean, not they have armed security and shoplifters nearly every time I go, with vagrants hanging outside the front doors. 

Although there are furniture rental companies out there, I would consider using your own or buying a decent second hand from a thrift store.

Observe nearby convenience and liquor stores carefully.

The BRRR book by David Greene https://www.biggerpockets.com/store/brrrr-ultimate.

I am renovating a kitchen and a friend of mine recommended a Store locally that sells RTA cabinets.