The Discord channel #chat-juego is connected to the server's chat: what you write in one shows up in the other. You can talk to whoever is playing without opening Minecraft, and follow the conversation from your phone.
Linking your account
Linking your Minecraft account to your Discord account is optional: type in the game and follow the steps. You do not need it to read or write in #chat-juego.
Rules
The game chat's rules apply in #chat-juego too. If your account is linked, an in-game mute also mutes you on Discord while it lasts.
Server notices and events still go out in #anuncios.