Check out the free content online of Bill Faeth. 

Established on line presence5.

From my experience, to succeed in multifamily investing, focus on networking through local meetups, online forums, and professional connections, leveraging your CPA skills to analyze deals and optimize deductions.

That's what I've heard from others and read online as well.

Though I appreciate the idea of finding online resources and studying them, I find that a curated, tried and true formula (if it works) is much more worth my time than spending time trying to find which resource works best and then spitballing the ideas until something sticks. 

Tanisha is the creater of the income snowball which is a patented system (you can look up the patent online) that allows you to create passive income from leveraging debt in form of credit lines.

Network (in-person events and online BP)3. 

Even though I myself have a S8 rental, what you hear online is completely false.

Here, once you have an account and a bit of lending experience, you can access the online, fill-in-the-blank templates to create your own set of documents. 

Paying for an online course before you know other investors and have gone to meetups is just paying to procrastinate.