Equity Optimization through HELOC

[Taylor Fontaine]

I'm very new to Bigger Pockets and my wife and I are interested in eventually getting into real estate as a side gig (for now). We've been researching quite a bit through this site but we also stumbled upon a different podcast where a guest was explaining how using a HELOC could be used to pay down our personal or rental mortgage down very quickly (5-7 years). They say the HELOC would be used as a revolving door for our income and monthly expenses instead of using checking accounts. I'm curious if anyone has heard of this or uses this and how it differs from just throwing extra money down on our mortgage when we can. Thank you for the advice.