I have made millions as a land lord and know exactly what I am talking about.
I bought my first property while still in college for myself. I used the savings from buying to save up more to buy a 2nd one to rent out. Then used the savings from those 2 to buy another. Repeat.
Until I had nearly 30 units before I even graduated.
When good deals dried up.. I later started buying lots and would build duplexes on them.
How old are you?