If you're looking for an alternative to linktree, bio.link, and others, I recently discovered [https://found.as], a simple service with a similar proposition—plus a major advantage: no email required for registration; just a username and password. You can also use rentry.co or fluffle.cc for the same purpose, but it might be complicated for beginners.
Besides XMPP, Delta Chat, and others, I'd like to start promoting [https://armada.buzz], an encrypted chat app that runs on the NOSTR network. It's still in development—even though it's already quite functional—it's worth giving a try...
This month I've already argued with two people—how many more until the end of it?
ROT47(To_Base32(?)) = er!a)zxl