No Debt is the best debt;
You really can't get rich until you get all the debt off your back;
They say the hardest is the first $10k then $100k, if you are smart when young, you can easily be a millionaire by 35; IMHO if you +18, buy a cheap old house or farm, fix it up, and put in a renter; Move on do it again, make sure the renter is always covering the MTG;
Never make a MTG over 15 years; That way when your 35+ all your rentals are 'free&clear' and all the rents are your cash;
When young time to time I would sell a property(s), normally cuz it wasn't a good rental; In that case I would always take the proceeds and pay off other MTG's on other rentals; Often the house I was living in, would not be a 'good' rental, super-nice houses make bad rentals, as most renters don't take care of homes;
It's much easier financing, and putting up down payments often 20% for a 15 year MTG; The hard part is finding good rentals, near colleges, or hospitals or schools where you can find 'good renters'
I doubt that being a 'miner' is a sure thing for wealth;
Lastly, by paying off MTG early on rentals, you can 'retire' early, you really can't fix up property's, and make money, until you have quit your 'day job'; All millionaires 'don't work for somebody else', all their time is their time;
99% all all great human fortunes in human history were made in 'real estate', deal with it, and remember that outside exceptions are a minority; Becoming an AI billionaire, is as likely as becoming a world class boxer, or sports star; But any 'forest gump' guy can become a millionaire in real-estate by just mowing all the lawns himself every week during grass growing season;