The 5-10 it gets heavier and a lot busier, and 10-15-20 it really is untenable to self-manage especially if this is not you main business like a person buying their own rentals and building it like a small business. 

Always use a property manager to keep your real estate investments as passive as possible and keep you compliant with Fair Housing laws.This way you can learn to manage the property manager and learn from experience as you go.If you buy a bunch of properties all at once, they may not all fit your buying criteria, there may be deferred maintenance that needs to be dealt with all at the same time, and you will not have accumulated the management experience building your portfolio one at a time.To Your Success!

We had no experience building a house from scratch but I did have a bank willing to lend to us.

Just bought 3 houses last week from a builder. 

This is where most people start getting nervous. And, honestly, it's for good reason. Having good residents can make owning a rental house a breeze, but bad ones can make it a nightmare. Fortunately, there are practic...

I only have 1 property under my belt and am currently house hacking my SFH. 

Figure out which best fits you and your personality and take it from there.  

I'd level up with a BRRRR, live-in flip, or house-hack before jumping into a challenging renovation.

There are any number of Real Estate schools available to you, so choose the one that compliments your learning style, whether that be online or in person or a hybrid. 

A contract is only as good as the person enforcing it.