There is a plethora of places with data on these but are there any fixed common websites that you check to verify the factors you mentioned?

We verified with mortgage broker that our timeline was realistic.

I'm not a plumber but recently took a plumbing course so please verify on your own.

Still verifying employment, still calling past landlords, still running the numbers on their income vs. expenses.

I think you had the ability to check with the utilities company before closing to verify if there was a balance due. 

You have to give them tasks from moment to moment, and verify that is what they are really doing for some of the jobs, like repairs.

I think I dodged a bullet and will wait for the right deal on a vacant property or one where I can verify tenants are employed and have been paying rent consistently to avoid the headaches COVID19 is causing.

In either case, you should verify that you are eligible to transfer the funds from your existing retirement account (e.g. if the funds are in your current employer 401k, you will likely not be able to transfer until you quit your job).Considerations in Setting up a Solo 401k to invest in real estate:1.

I will verify with the utilities.That's the question.

Of course, trust but verify.