Given that investing is often more about time in the market than timing the market, it’s imperative that our youth learn these foundations early.

I received something in the mail from a tax attorney about appealing my taxes to potentially lower them and now am considering it for the first time.

I would suggest to speak with a broker or someone familiar with the process and have them review a full package and try to look for any possible red flags in advance. 

You didn't mention the time frame but if that opportunity was a few years ago they had upward pricing pressure (hence $200k high sales price) and lower interest rates bringing in more offers.

So the time it takes to manage someone else property is going to take more time than just managing your own.  

I'm diving into QuickBooks Online for the first time and could use some guidance.

Hate that it happens, but it definitely can.Might need to calculate what your time is worth and deciding next steps from there.Good luck! 

Even a marginal real estate deal will often look better over time if you stick with it.

I get second position notes for my properties all the time.

As far as more technical financial analysis you mentioned above, I have found it is easiest to track these items in excel - I just update the workbook each time I analyze.