It's helpful to identify the comparables that you've used to price the property, and to figure out what your property has that the comparables don't.

Maybe if you are interested in identifying issues, but not with the estimate. 

But the best way to start and really identify what you want is to find a person whom you trust.

But for an interior of the house where you as the owner reside while renting out to roommates ("house hacking") - is there a camera or system anyone can recommend for:1) Monitoring guests brought over by roommates in the common areas (my friend has a guest policy and cameras would obviously help ensure the policy is adhered to)2) Potentially helping police identify someone should they break into the house?

There is four of us who get on a zoom call every week (for the most part, schedules conflict sometimes) and we discuss new things we have learned, how our investments are going, we discuss issues/concerns, and then we identify goals to complete by the next meeting.

We have identified around 1.5M California properties that would have the space for an ADU.We've been wondering about providing a service which is a quick evaluation for investors to confirm feasibility, estimate build cost and rental returns.

To answer your question,  I would focus on learning the numbers and identifying a good deal.

I have really struggled the last 8-10 months to identify deals that meet my criteria in my target investment area.

I also think there is potential in Edgewater and Wheat Ridge (a little bit sleepier for some reason, but they just added a big food hall).I'd also look at E Colfax due to the city's East Area Plan and the Denver Opportunity Zones (specific low-income urban and rural communities areas identified for favorable treatment of reinvested capital gains and forgiveness of tax on new capital gains)

I believe if you are looking for a deal that isn't a scam, you should be doing your own due diligence on any property that you come across and identifying and sticking to a buying criteria that you have set out for yourself.