easy jobs to do while in uni

Hello, I've been trying to apply to various jobs all summer, but the job market is terrible, and I'm just wondering, what jobs do you do while being in university? I'm starting university this year, so I am just figuring this all out, but I need to have some way of income. I've tried to apply, and I've been to interviews, but someone's relative is always hired before anyone else. :(

So I came here to ask what are some jobs you do while being in university?