I purchased my duplex last year at age 20. I "BRRRR'd" it without really realizing what that was and now I have purchased my second rental property - a single family home that needs just the right amount of work.

I want to know, what's your best advice? 

How can I continue to build on this? 

What should I plan for? What's practical? 

I'm incredibly determined and can't stop thinking about the future but don't know where to go from here. I like to plan for things. 

Also curious what books you all recommend (other than the obvious bigger pockets books). 

@Robert Burciul If I were you I would buy small multi-family properties if you can with your owner occupant loans. I am representing several clients in the Berwyn area where I work who are house hacking three and four units, and I wish I was in a position to do this strategy. It is one of the most amazing ways to build your portfolio and get land lording experience with "training wheels" on!