I came across this video where they mentioned infinite banking. Basically, you would sign up for a life insurance policy which you can borrow from which also provided guaranteed payouts plus dividends. I thought it was an interesting concept. The idea of being your own bank.
Another concept was velocity banking, where you would borrow against and HELOC to pay our bills or make investments. Also, it could be used to pay off your home quicker as the way interest is being charged is different between your mortgage (which is amortized) where a line of credit is a revolving interest rate.
My biggest takeaway is that you can leverage these concepts in your brokerage account. This changes my strategy a little bit but I will share when I have time.