Check out other online guides available here: https://www.biggerpockets.com/guides3.

I contacted that agency this week online & got a response they are not writing commercial properties now. 

I’m always looking to implement best management practices so what can I, as a landlord, do to protect myself when accepting online payments?

-I'm fairly careful with communication , but again, I know doing business online is way riskier, but I want to ask: Typically, I would trust someone who seems very in-depth, informative (gives statistics and numbers), and basically would give me thorough steps (including worst-case scenarios and what would best fit my situation)^^would people who have experience say that even with the above, some agents/lenders/PMs would still be sort of out to get your money and do a lousy job?

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

@Yosef Ajami, we use Quickbooks Online for all of our Clients (including syndicators).

Every contact I needed for insurance, mortgage and cleaners were done online, mostly through connections from BP. 

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. 

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. 

So here is what I do:1 - Get buyer criteria for what they are looking for (exact criteria)2 - Go source that criteria using data provider3 - Scrub the list and plan a marketing campaign around it (i.e) > Direct Mail > Cold Call > SMS > Online Ads > Social Media, etc4 - Once I get inbound leads coming in.