That is not true, if you start too early and lack experience and then have a deal go bad, it can set you back 5 to 10 years.

One lesson learned: Create a good relationship with contractor and shop around for the best pricing on materials.

This is true.

Though I appreciate the idea of finding online resources and studying them, I find that a curated, tried and true formula (if it works) is much more worth my time than spending time trying to find which resource works best and then spitballing the ideas until something sticks. 

If not, stop looking for up and coming, look for tried and true.

Cash flowing better might not be true in all markets.

I believe that within three years, rates will be much lower, and you can refinance.Another consideration is that once you get a property under contract, you should immediately shop around for better rates.

There's no true data source that aggregate all the data that you look for (at least to my knowledge).

Hearing from many testimonials by talking to real Padsplit owners in person, it seems to be a true cashflow machine coming from a single family residence.

Quote from @Kevin Sobilo:not necessarily true.