How to manage Real Estate Debt?

[Alex Ng]

I'd like to accumulate more properties using BRRRR but it also means I will be acquiring more debt. At some point the debt will be too much beyond my normal job that I will need to rely on the cash flow from properties to cover them. How can I manage the debt as I continue to expand and grow? Are there any rules on how to leverage property safely? How much equity - debt ratio should I aim for? How can I ensure the property will stay rented? What if a great recession were to come? I'd like to know what are some tips you have to manage debt.