Any recommondation for a bike for a beginner? Not planning to use intensely.

I will be going to college next year and it’s a relatively small campus where bikes are the easiest way to get around. I’m looking for something that will be sturdy and good for a while. No need for anything fancy or especially aerodynamic and fast. Now that I think about it, I don’t even know what “anything fancy” means on a bike.

I plan to ride mostly on roads and sidewalks, but will also do some riding on grass and dirt. I heard that a hybrid might be good for this, but I am very new to all this.

As far as price ranges, I was hoping for around $300 to $400, but I came up with those numbers before doing any research at all, so they might be ridiculous.