Investing in the markets using borrowed money is hardly ever a good idea. Sure, some have done it and succeeded. Those are the people that talk about it. The majority stay quiet because they lost most or all of their money.
One example I bring up from time to time is the secular bear market of 1966 to 1982. How would one invest in this kind of market? Would you take out a loan and put money into it?
When will the next secular bear market happen?
Edit: Note the date this article was written. Things were much different then. Apply today’s conditions and you might see some correlation with that 66-82 period.
https://awealthofcommonsense.com/2014/06/1966-1982-stock-market-really-bad/