Maybe you have already secured your first job before your graduation. In that case: Congratulations! Then you do not have to be concerned with the job centre at this time.
But perhaps your job search has not panned out just yet. Don't worry about that. Even though it's less than a dream situation, it's what many recent graduates experience.
➡ Not having a job yet, it is very important that you acquaint yourself with all the rules and regulations related to the job centre. Here is an introduction to begin with.