What I learned from here is that, if it sounds and looks suspicious, do not click it. You can already recognized it from the way how their usernames constructed- it is usually jumbled letters with many numbers. Aside from that, if you can see the preview of their messages, their grammar is a whole crap. So better watch out for these signs!
...About files shared in an email or any chat platforms like Telegram, Discord, never click on it is a vital rule for everyone. It is more important rule to obey if you received it from a stranger, more reason to never click on it and download file then open it.
Spam folders are really a great help to avoid scammers or any other suspicious and fraudulent activities online. I'm not saying that you should not visit this section on your emails, but you should also try to visit it, because sometimes when you are waiting for an email from someone and this sender is new on your inbox, they might go to your spam. So better get their details so that you can check it beforehand. Also don't forget to delete those spams- it will save your space plus it will reduce your carbon footprint!
...About email you received, I would like to ask. Did it come to your Spam folder?
Mostly emails from scammers will come to Spam folder that is a signal or can be considered as a red flag, don't click on it if the sender is a stranger.
Generally, don't forget to always think before you click. Do not let your curiosity governs alone, gear up with knowledge so that your assets are secured.