Honestly, it's from studying hard and actually implementing much of the advice of gurus like Dave Ramsey and Robert Kiyosaki, and people here on Bigger Pockets and other financial podcasts and books. 

I’ve been studying the strategy for awhile but I’m still nervous about doing trying ut. 

My guess is there will be dozens, hundreds, or thousands of case studies to examine a few years down the road to use 20/20 hindsight to evaluate outcomes.On your second question about extending grace vs being tough: that also depends.

Invest based on your goals and resources, make sure you study everything before investing. 

If the seller files bankruptcy in the future you have to prove to the court that you bought the house fairly.

Arbitrage is a short term game - covid and the end of covid proved this.

When I finished my first flip, I felt so good because I proved the concept, and it made my vision clearer.

In my particular case, it was recommended I get a WY Statutory Trust for each property and then have a separate CA management LLC for our STR's that would rent from these Trusts in lease agreement/rental arbitrage situation.I usually just trust the professionals, as I know you've studied and practiced this for many years, and I'm just entering the space.

I am thinking about multifamilies in other areas semi-close to Philly, but I will have to study the markets for sure.

Use sites like Bigge­rPockets for study.