> Instructed by forums is this:
https://docs.moodle.org/38/en/Cron
Which one: CLI? wget?
https://docs.moodle.org/38/en/Cron#Working_out_the_Moodle_cron_command
> My moodle is automatically updating itself, so maybe that could be a problem?
So the server chanes although you are not changing anything (manually)? Not that it is a problem, when everything works. When not, yes, then there is one more unknown.
> But I don't get it, because even if it is updated a cron job is a basic script, which I run in browser manually or set a cron task on hosting to run it every x minutes.
Yes, triggering the cron.php is done outside of Moodle.
> Well which logs will tell me where the cron job stops or where is the problem?
In the default CLI cron, the logs are sent to the mailbox of the user who invokes cron.php.