This is an interesting video from Gary Vee.
Please note, it was filmed in 2018. Meaning people got into debt, bought at 18k and then Bitcoin plummeted to ~3k. Yes, I know that in hindsight, those people were lucky, but no, they weren’t. It took over 2 years for the price to go up again, and they had to make their loan payments, credit card payments, sell their bitcoin at a lower price etc.
The takeaway from this is solid advice: Only invest what you can afford to lose, HODL for many years, don’t go in for the quick buck even in a bull run such as the one at the time of writing this (April 2021, BTC @ 51.000 euro), and the biggest one is that this is not a get rich quick scheme.