Just borrow money when you really on need. Like to pay some bill or for medical issue.
And before borrowing some money, you need to find a way for pay them back with interest.
If it is not so important, don't take a loan.
That's true, for some case bitcoin is not suitable for lending platforms. That's why we better not take a loan both in BTC or fiat currencies.
And if someone take a loan from BTC, either the BTC price going up or down, they need to pay the loan money back + interest with BTC again. Never make loan with 'lock rates or price' contract. Believes me, it will make you loss. Beware of loan whale.