Best evaluation tool for SFR or 2 Unit Multi-Family Hoes

[Ray Jansma]

With all the tools and calculators for financial analysis, which ones would you rely on more heavily for SFR and small multi-units? It seems like sometimes some of them contradict each other. As a new investor, I'm looking for a little bit of clarity on how to decipher on what's important and what not to focus on when dealing with these kinds of properties. Thanks!