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

It’s no accident that many of the groups you see today running into serious trouble are groups that acquired a lot of assets near the market peak using tools such as this that juiced projected investor return. 

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

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

It is a state--spedific, specialty tool not used all that often as the buyer/ Optionee at this stage of the market cycle. 

But his advice are useless for people building wealth as leverage is a very useful tool.

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

Any other tips or tools that have worked for you when investing and you think I should definitely consider?

Seller financing can be a fantastic tool, especially for multifamily deals, and I’ve had a lot of success using this strategy.

Any government has only two tools of control: guns and currency.