Name something you've learned from someone on BiggerPockets (podcast, forums, blog, whatever) and tag the person from whom you learned it. Name as many people as you want, but please limit your posts to one-person...

How do the pros acquire so many properties in such a short amount of time? I listen to the BP podcasts and the guests are always talking about growing 5-10+ units a year. I bought my first house in 2013, and am loo...