Its not rocket science, though these " gurus " make it seem as it is .Good luck 

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I am going to be the voice of caution on section 8.. especially low value low priced section 8.. those are in the roughest neighborhoods in America.. there is very little change of appreciation unless rents rocket up and section 8 is pretty stable. also your tenant base is very tough on the homes so your going to have far more annual maintenance on these than buying a much better class of property.

The treatment of the unit by the tenant.If a tenant has lives there for 20+ years and there are no updates and they smoke, you can have to renovate every square inch + appliances + front and back hallways, you can get over 30k easy.If the tenant trashes the place, same thing, you can spend 30k on a newly renovated place.With labor cost and material cost sky rocketing turnover’s are becoming a major issue for our clients and are sucking up cash flow.We are starting to do things like waive rent increases for good tenants, increase habitability by adding in suite washer and dryer, and whatever else we can do to get 3-5 year tenancy.

Seriously friends, this is not rocket science and isn't that hard to learn.

The second problem we have is both Russia and China have Hypersonic rocket systems. 

This isn't rocket science, it's kind of common sense to HELP the person who is in control of dictating what your property is worth, vs going to lengths of being a pain in there azz.

Nine Million Americans Priced Out Of Housing Market As Affordability Crisis Worsens The National Association of Realtors (NAR) estimates millions of Americans have been priced out of the housing market since January as sky-rocketing mortgage rates spark an affordability crisis.

You might as well be holding rocks.I like to think there will one day Musk's rocket will discover a planet made entirely of gold. 

This was under 5k total owed according to them.They never hired an attorney or went through the proper process, filled a generic mechanic's lien (found on rocket lawyer), and filed them with the registry of deeds.