I think you gain this knowledge as questions from buyers and sellers arise over time.  

The 7/1 ARM is popular as it fits with a lot of my client's needs but the question I always ask to give you the best options is, what are you trying to do with the loan product?

Purchase price: $1,250,000Working on "BRRRing" a 15 unit commercial/apartment complex in one of the most popular areas of town, but also the hardest to find a good deal.

Looking into creative financing at the moment and wanted to know what avenue's people on here prefer... conventional 30 yr is what I assume to be the most popular, and I myself cash flow with conventional 15 yr so prefer that. 

But post 2008 crisis, the combination of low interest rates, low unemployment, high property appreciation, proliferation of syndicates, YouTube videos touting RE riches and more chatter around blogs, RE sites etc, all of that had made RE investing a lot more popular among various tranches of the middle class.

The extremely popular areas for rehabs right now are close to downtown, Dignowity, Denver Heights, some parts of Highland Park.

You want to study what other investors and the builders are doing so you know what colors, features, styes etc are popular in your area. next is to learn how to get deals direct from the sellers and the MLS as well.

The reason I say this is because a ~5k sqft four unit residential property in say very popular Richmond District is running for less at $2.5M

While there are many ways to measure investment performance, few metrics are more popular and meaningful than the return on investment (ROI) and internal rate of return (IRR).

I found a real estate agent in my city who seems to have nothing but glowing reviews and is really popular in the city.