I would recommend listening to the BP podcast, they cover several different topics/investment strategis and it would be a good tool for a new investor that's unsure how they want to invest.

FHA has the self sufficiency test which also makes 4 units more valuable because you have a better chance of pass the SS test with 4 units versus 3 units. 2 units doesn't require the SS test so buyers also tend to like that inventory for FHA so they can avoid the SS test. 

BP has various tools to help you analyze your deals (rentals, flips, wholesale, etc). : https://www.biggerpockets.com/investment-calculators7.

Hello Drew, thanks for sharing this is valuable information.

But it's a great tool for practicing analyzing deals :)

But probably more valuable is my day-to-day experience.

Connecting with local agents who specialize in investment properties can offer valuable insights into the market's current state and potential opportunities.Networking with Local Investors. 

Working with a partner or family member on your first deal to spread your risk and learn valuable lessons. 

As an investor, your credit is  absolutely the most important tool you have. 

What data do you gather and what tools do you use to optimize this process?