Advice for someone starting first job

I’m not sure if this is the best place to go for advice, but with everything I’ve been seeing about working in this country, I’m a little nervous to start out. I just got a part time job as a janitor at a local convenience store, and I’m wondering if there is anything I should know that I don’t already. So if anyone has any advice or tips to give me, I’d greatly appreciate it 🙂