Cronjobs
Cronjobs are now titled scheduled tasks.
They are not visible in the Backend (Administration) and cannot be configured.
They need to be set in the server / hoster config. For almost every hoster you will be able to use this code:
php /path/to/shopware/bin/console your-scheduled-task:run --time-limit=295 --memory-limit=512M
For bigger tasks like product exports you should write separate commands and run them in own cronjobs.