NixOS - Beginner Resources for Flakes

Hi all! I'm trying to learn more about NixOS and wondering if anyone had an material they'd recommend that was Flake centric?

I'm planning to test drive NixOS on a secondary laptop as a learning opportunity- not planning on using it as a daily driver at this time, so I'm not too concerned about the learning curve; I realize it'll be a bumpy and steep road!

I did want to give a shout-out to @LunchEnjoyer@lemmy.world and everyone who replied in the NixOS beginner resources thread! Tons of good content shared there that I'm still working my way through.