Student halls can be on or off campus, and are operated by either the private sector or by the university. Generally the rent includes your bills. Most often halls are only for first year students (although if you are a care leaver, international student, or have a disability, you may be able to stay longer). You would usually be sharing spaces such as the kitchen and living room, and sometimes a bathroom, with your flat mates, and then have your own lockable room. The kitchen and living rooms come with things like ovens, freezers and sofas, so you don’t need to worry about those. Your room will have space for a bed, desk and storage, which are all provided. Student halls usually have a 24 hour warden available to help with any issues.
It is well worth checking out the accommodation options when you go to open days to see if you think you would be comfortable living there. Some universities also have videos of accommodation tours on their website.