Long-form note
You can link to a long-form note by using its naddr identifier:
naddr1qqgkcmmwvukkvmmjd5kkxmmww3jkuaqzypl62m6ad932k83u6sjwwkxrqq4cve0hkrvdem5la83g34m4rtqegqcyqqq823ccxjlgq
Note
Notes can be linked by pasting their note identifier:
note1069cr5elneqvv4yfhqgafh4k3mwgz75emat7vqk5j9dhmjlxlq4qa60tcj
Or better, using nevent which includes relay information:
nevent1qqsf2q8wd4e3kpek0ml0pnfw2sl779wc4pec73v9s6tdyw9wtsme9vgpz3mhxue69uhhyetvv9ujuerpd46hxtnfduq3samnwvaz7tmjv4kxz7fwwdhx7un59eek7cmfv9kqyhwn2c
Profile
You can mention someone by pasting an npub.
npub107jk7htfv243u0x5ynn43scq9wrxtaasmrwwa8lfu2ydwag6cx2quqncxg
The nprofile entity contains a user pubkey and a list of relays so is more likely the profile information will be found.
nprofile1qqsrhuxx8l9ex335q7he0f09aej04zpazpl0ne2cgukyawd24mayt8gpp4mhxue69uhhytnc9e3k7mgpz4mhxue69uhkg6nzv9ejuumpv34kytnrdaksjlyr9p
Relay
Relays can be linked to with the nrelay identifier
nrelay1qqxhwumn8ghj7mn0wvhxcmmvxgjuum
nostr:nrelay1qqxhwumn8ghj7mn0wvhxcmmvxgjuum
Badges
Badges can be referenced by their naddr identifer:
Lists
Lists can also be referenced by an naddr identifier:
naddr1qvzqqqr4xypzqla9dawkjc4trc7dgf88trpsq2uxvhmmpkxua607nc5g6a634sv5qqphq6twjv36ug
Happy writing ๐