You can probably find an online link about how extreme temperature changes are not the ideal way to heat a home and cost more in the long run.I don't know what the local rental rules are where you are, but look them up and see if you can give her notice. 

Jackie has a good point that much of it is free on line.

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.

You can research these online.

Check online reviews and interview multiple contractors to compare bids.

I wouldn't say you're going to learn as much going through an online course as you would an in-person one, but it is a lot more convenient. 

Obviously, using the online listing page at ALE solutions is different than a cold email, and I am referring to the latter.That brings up an obvious question: how do you develop those leads, then?

I do agree with everyone here that their customer service is by far the best I have ever had comparing to any other online investment platform.

It's challenging to distinguish between genuine advice and potential scams in the vast sea of information available online.

There's a bunch of online courses available, look for the ones that offer the self-paced $100-$150 courses.