Another option you will see online are companies selling shares to sections or lots of trees via a tree plantation management company.  

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.

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

check the local municipal code, most are online.

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

Also, whenever possible I create wish lists for the next phase, and when I'm ready to start I put it in my online cart and go.Everyone has been burned by everyone.

I've joined facebook groups and looking around online for a mentor in the city or near the city I plan to invest in, I've connected with someone and plan to speak to them monday but nothing is promised but I'll look into them again.

You can find different strategies on how to find and reach these folks, such as driving for dollars, targeting mailing lists, networking with Realtors and other wholesalers, and having an online presence, plus paid social media ads, etc.

Check out the free content online of Bill Faeth.