Hi Bili, not one of the experts myself, but I can tell you that "zapping sats" is one of the really groundbreaking features of nostr. A "sat" is the smallest unit of bitcoin, one 100 millionth of a bitcoin. Nostriches send these units to each other. There is a lot more to learn about bitcoin especially regarding self-custody but a good way to start is install "wallet of satoshi" on your device and link your lightning (bitcoin) address to your nostr account. You should be able to find some tutorial videos.