Easiest by far to get started with is nostr:npub1h2qfjpnxau9k7ja9qkf50043xfpfy8j5v60xsqryef64y44puwnq28w8ch . It's custodial but it's dead simple compared to some other options mentioned.

Want self custody? Use Zeus. Requires scanning a QR code to send zaps.

Want to run your own node? Use alby/umbrel/something similar.