How I Lost $50K with One Accounting Mistake

Do you have a recommended technique for those of us who do our own bookkeeping and aren't using Quickbooks Plus or Advanced?

Do you have any bookkeeper you recommend that follows your strategy? I run a realtor and flipping business, and I have 30+ long-term rentals and a few short term.

Can i generate Owner's report in Qb (reports from property owner's POV) while I am accounting from property managing Companies POV?