Apparently, Mark Cuban's wallet was hack for a large sum. I hate to see stuff like this happen to anyone for any amount.
While articles like the above have useful information, they don't teach one how to fish.
Back in 2017, I rolled my own way implementing cold storage for my sensitive data.
The article below will teach you have to do the same, if desired.
Since 2017, I've kicked the Windows OS to the curb and using Linux only from now till the end of time. But still loving PowerShell even on Linux.