FTX has taught many people an important lesson, not your keys, not your coins.
The number one thing that matters in the cryptocurrency space is self-regulation. Never put all your eggs in one basket, Take profits!
Not your keys, not your coins is a familiar phrase and we are always being reminded about that because FTX isn't the first crypto exchange that have collapsed but we have the legendary Mt.Gox and other smaller ones. This was still a good reminder though in case some of us forget it already and serves as a lesson for those who are new in here.
Another lesson would be is to not trust or invest in exchange tokens because they are too shady and many of us mistaken it as a good investment because they only based on the reputation of the exchange but that is wrong. We shouldn't judge those exchange tokens that way when we don't know their full story.