How to use Talk for System Messages from Bash Scripts

Hi,

i looked around quite intensely to find a solution to use a system channel in Talk to receive system messages from various events.

I use various bash scrpts for example to automatize backup procedures and i would like to send status messages to a Nextcloud channel. I really don't know where to start here, the official docs are no help for me and most people use telegram/whatsapp for this, which i try to circumvent.

Is there any tutorial from the very first step to begin with to solve this task? I don't know, if i have to install bots for this or if i just need a system user to be created or how to send a message from script successfully.

Any help would be fantastic, please try to avoid pointing to the offical docs, as they have just overcomplicated wording/explanations which are no help for people like me without professorship in programming.