You should definitely try stuff like Cashu out, it's pretty awesome. Couple things:

Nuts, mints - these are terms involved in the Cashu ecosystem. I suggest trying out a Cashu wallet like Minibits (Android) or cashu.me . Use small amounts and treat those sats like cash in your pocket. cashu.space is a good place to learn about the protocol, and there are lots of nostr:nprofile1qqs9pk20ctv9srrg9vr354p03v0rrgsqkpggh2u45va77zz4mu5p6ccpzemhxue69uhk2er9dchxummnw3ezumrpdejz7qgkwaehxw309a5xjum59ehx7um5wghxcctwvshszrnhwden5te0dehhxtnvdakz7qrxnfk podcast appearances you can listen to. Cashu is a custodial ecash system built on top of Lightning.

Payjoin transactions happen on the base chain and help break assumptions made by people surveiling the network. payjoin.org can do a much better job of explaining any of that than me.

These things are complimentary to each other, rather than competitive.