deevman
It varies depending on the server, setup, install paths, etc. We have no way of knowing your server and setup as you haven't provided any information. I recommend that you google or youtube "how to configure a cron job for a php web application on [server_name_here]" for clear and accurate instructions. Since you want video tutorials let's say you are running Ubuntu 26.04 LTS, you would go to YouTube, search "how to configure a cron job for a php web application on Ubuntu 26.04 LTS", and I'm sure you'd find many guides.
Essentially, all you need to do is configure a cron job that ensures PHP executes the /path/to/osticket/api/cron.php file on a regular schedule. On typical Linux installs you'd edit your /etc/crontab file, set the time to every 5 minutes (or whatever you prefer), and set the command to something like php /path/to/osticket/api/cron.php. Obviously the php will be replaced with your server's php shortcut name or even full path the the executable and the /path/to/osticket/api/cron.php path will be replaced with the full path to your server's osTicket cron file.
Cheers.