Landlord Must-know formulas

[Aroldo Villarreal]

What are the must-know formulas that long-term (rentals) investors must know? For an easy example, everyone needs to know cashflow, which looks like:

Cashflow= Rent- all expenses and reserves

I started investing and educating myself at the beginning of this year, so just want to make sure I have all formulas and numbers I need to know. 

I hope I get many!