Hika's Guide to Matrix (Discord alternative??)
Public Matrix Servers (Start here!):
https://servers.joinmatrix.org/
Clients:
Element: https://element.io/en/download
Cinny: https://cinny.in/
FluffyChat: https://fluffy.chat/en/
Commet.chat: https://commet.chat/
NeoChat: https://apps.kde.org/neochat/
Find rooms to join :
https://matrixrooms.info/
https://joinmatrix.org/guide/popular-rooms/