There's one time that I'm so sleepy but need to fill up something to participate on a airdrop but unfortunately instead of putting my address in the sheet I accidentally put my private key and next to that someone stole my asset stored on that wallet and luckily I don't have big balances stored at that time so damage has not so big and I really learn a lot of lesson for that mistake I made.

For advice never do anything especially if its important if you are sleepy since everything goes bad once you are not fully aware on what you are doing.


Best way store it outside/offline to avoid getting penetrated or commit mistakes for handling it. Worst is to save it on apps or any online platform since risk is so high there.