Ahead of the Path of Progress, but how far ahead?

[Joseph Gillespie]

**First poster alert** I have heard variations of 'if you can get ahead of the path of progress, you'll make money', but how far ahead of the path of progress should you shoot for? What are some signs that you are ahead or behind the path of progress in an area? 

Context: I am looking to jump into my first REI, and am thinking of using the BRRRR approach with multifamily (duplex-quads). Hoping for some insight in how to align finding a B/C property in an area that may be 'ahead of the path of progress'.

Appreciate anyone's/everyone's insight(s) in advance!