If you're only gonna do 1, I recommend wss://nostr.wine but there's several others you could consider....
wss://paid.spore.ws - 420⚡
wss://relay.nostriches.org - 421⚡
wss://bitcoiner.social - 1000⚡
wss://relay.stonez.me - 1000⚡️
wss://nostr.milou.lol - 1000⚡️
wss://nostrsatva.net - 1500⚡️
wss://relay.nostrati.com - 2000⚡️
wss://nostr.easify.de - 2100⚡️
wss://nostr.uselessshit.co - 2169⚡️
wss://relay.thes.ai - 3333⚡
wss://nostr.ownscale.org - 4000⚡️
wss://relay.nostrview.com - 4000⚡️
wss://nostr.naut.social - 4000⚡
wss://relay.orangepill.dev - 4500⚡️