I'm sure they have a never ending source of articles on this topic as well. 

As has been discussed in other threads, in the event of true loss of job, no unemployment, no gov't bailout, no savings or liquidity, no other sources of income, a very small minority of tenants will truly be unable to pay rent.

What source(s) are you using to validate your estimated rental income? 

@Kevin Paglia Consider the source.  

In my experience, Sec 8 is a good source of income as long as your tenants know the rules and are given a clean place if you give them a dirty place your setting the standard for them.

Over the last year, Courtney Buck Investments has been sourcing, raising capital, and investing in the large multifamily space, you may be wondering how we purchase to preserve capital, pay at or above a preferred return, and reduce our investor's taxes.

Very good source of information

Input from multiple sources on stuff from tenants to getting financing to SBA loans to evictions to foreclosures to short term rentals.....everything is changed. 

They also had an issue sourcing laminate flooring (on backorder).

I believe some managers try to get a full month on renewals as well, but that should not be the case.I also found in general my repair costs went up with management companies versus sourcing my own.