Are there other, more cost-effective alternatives to gain similar support and knowledge?

"there are plenty of reasons why a landlord should care who is looking at their property, theft and their own personal safety being the first 2 that spring to mind, followed closely by not wanting to waste their time" These are valid reasons but depend greatly on your market and who is showing the property. 

Stop hanging out with your deadbeat buddies who spend all day drinking, talking sports, and otherwise wasting away.

You should definately expect a good ROI, but I dont' have data to show how that would effect it would have on revenue.

While I did not work with other agents or lenders for this particular deal, my professional experience ensured a smooth transaction and effective project management.

Sometimes, buying an existing property can be more cost-effective and less time-consuming and maybe require slightly less permits, etc. 

In online forums, the danger I've experienced is the "national" effect. 

We do have a property management company and even with our experience with LTR's, just no way we could effectively manage this home without local property management. 

I've been informed that completing the course alone may not be sufficient to pass the exam, so I’m seeking advice on how to prepare effectively once I complete it.Currently, my only other resources include a YouTube video, five practice exams, and a textbook.If you have any additional suggestions—whether online or in-person, paid or free—that could help me effectively prepare for the exam, I would greatly appreciate them.

Begin by targeting distressed properties in gentrifying neighborhoods, securing financing through hard money lenders or private investors, and focusing on cost-effective renovations.