I just looked online and saw that in Seattle for months to month lease the landlord is only required to give 20 day notice.

For reference I own exactly one handful (5) SFH  rentals in my hometown, all have been purchased in the last 4 years.1) buying at a discount is MY preferred way to reduce risk.

Go to Etsy and search for "rental property tracker," and you will find hundreds of nice spreadsheets to track 10-20 rentals, usually for under $10.Software has extremely helpful features like online payments, marketing syndication (click a button, and your property is advertised on multiple sites), electronic document review/signing, maintenance tracking, and owner reports.

In my experience, most of the online calculators are just taking an educated guess for you.

An option for you could be to go with a DSCR loan with a reduced prepayment penalty period so that you can get funds soon and if you want to refinance next year or the following due to lower rates or wanting more LTV than you're able to do so.You should look at this one with the mindset of:1) What would my expenses be once I refi vs what they are now?

The use of online classes has been increasing every year and are projected to continue to increase.

Is the information about “In MA, tenants generally have 30 days to pay repair costs...” available somewhere online? 

check the local municipal code, most are online.

However, for a commercial property or a commercial residential (5+ unit) property value is based on the income approach and reducing expenses in this case by producing electricity factors into that math and very well might increase the valuation enough to make sense.

I'm pretty concerned to get into this now as Project 2025 is pretty clear about gutting HUD and many social services- the program may be greatly reduced during Trump's term, hard to say.