Here's a quick how to lose your funds guide.
1. Keep your coins at various exchanges rather than your own wallets.
2. Send large amounts of crypto to unknown people who you've never had business with and who have no presense in the space.
3. Be as disorganized as possible with your backups, ideally you shouldn't even have any backups, if that hard drive fails, your funds dissapear too.
I keep my coins both on my own wallet but also some of them are in Binance.
I know that there is a possibility that an exchange can be hacked but keeping them on the exchange helps me to make my trades faster and with no deposit withdrawal fees. Trading is a risky activity and this is something that relies on it.