This is still a thing, see bitcoinpaperwallet.com

Not OP but there's a lot of useful old blog entries about this topic to explore at curedmeats.blogspot.com

Thank you!

I've heard good things about FastAPI

Same except I bought an old Toyota Yaris for £2000 cash. It's cheap to maintain and is super reliable. The missus would like a Mercedes G wagon though.

Based on your description I'd guess you are referring to bittylicious.

It doesn't ring a bell, and nor do old versions of that site on archive.org - but it looks like the exact same idea.

For more info you can check on whattomine.com to see if any alts may be profitable to mine with GPUs.

Andreas A's bitcoin and ethereum books are quite good for a technical understanding. You can buy them or read for free at https://github.com/aantonop

Bitcoin has a testnet.

Me too, mostly after reading this article, https://en.wikipedia.org/wiki/Niko_Bagration

What's the only way to generate a truly random string?

Ask a Windows sysadmin to exit VIM.