When using other people's money to invest, you will have to take a lot of pressure and it will make you lose in this market. So just investing with my own idle money is enough, I've seen many people borrow other people's money to invest and they never get a good result.
Indirectly, we are not taught to owe or lend money for investment, because investment is a job full of risk, even experienced people have experienced losses in investments, so obviously in this case it's better to use your own money according to your ability that we have, because it's far better than debt.