+ don't investment with money that's not yours or you can bear losing
+ don't fall for smooth promises
+ investigate what you want to invest in
It's generally not advisable to go borrowing just to invest because of the discomfort that come from such act when the market is in an unfavorable condition, it becomes too much for newbie to handle and then individuals that don't have the experience will easily fall victim to manipulation in the market. Excluding this borrowing to invest isn't entirely bad but that should be left for the professional and don't go putting yourself in a situation that you can't get yourself out off.
Leaning from others mistakes is quite underated in this space as many don't seems to do so because if we were actually learning from the mistakes of others then most of the craps of a trend popping up every now and then won't have become a norm.
Assuming lessons were learnt from those who invested in the hyped crowding funding trend (ICO) back in 2017 and lost, we won't have been having same rush for the meme craps and NFT bullshit.