These days I see people complaining again about validators making a lot of money, MEV front-running unethically... Basically, when you're queuing on the chain, don't expect it to be completely fair, so it's even more important to protect your wallet. Don't take photos of your seed phrase, don't store it on the cloud, keep it offline if possible; I’m becoming more cautious with signing/approving transactions now, avoid clicking unnecessarily, and if you do, make sure to check whether it's a "transfer" or an "infinite approval" first, so you don't slip up and give away your assets. Phishing sites are the most annoying, they make the page look just like the real thing, I’d rather search for the link a few more times than click directly.

What I don’t regret is: every time I want to impulsively place an order, I first close pop-ups and review the approvals, even if it takes a bit longer, don’t let anyone cut in line. Anyway, I can't make quick money like that, at least I won't lose it in low-level traps.