Lens recommendations for a beginner in photo/videography?

I own a Nikon D3300 with the standard 18-55 Nikkor that came with the camera when I bought it. I'm enrolled in film school and it's about to begin shortly, so I'd like to know what kind of lenses I would probably need for shooting videos. We will cover commercials, documentaries, some photography, short films, etc. I've been told to get a wide angle lens by a few people, but I'm thinking of a zoom lens as well… Anyway, any recommendations? Please explain in simple terms since I probably won't understand most of the technical jargon and I'm still a beginner. Thanks in advance.

Added (1). B K: I've learned about lenses and focal lengths and finished the first year of film school (sorry if my talk of being a beginner sounds like I haven't learned anything, but by rights I'm still very much a newbie compared to my classmates) and the 18-55 has been enough so far. But I was advised to get new lenses since second year will be more intense. I know I'd need new equipment sooner or later, and I'd like to buy them now since I'm on holiday and they're a lot cheaper in my home country.

Added (2). B K: Yes. I've tried to get more information on what projects we'll do next, but the best I got is "documentaries and short films." So definitely nothing crazy like wildlife or sports just yet. I guess I'm looking for an all-around lens that can fit multiple purposes? Sorry for the lack of information, but thank you anyway for your answer and consequent updates.

Your 18-55mm lens is already wide angle at the 18mm end of the zoom. It is already a zoom lens, it goes from wide angle (18mm) to moderate telephoto (55mm) on your camera. It's good for many kinds of photography (and video), from landscapes, to group shots, to portraits.

For now, the 18-55mm will be fine. You will soon know what you need when you learn about lenses and focal lengths, and which are best for what subjects. That will be covered in your course.

Buying lenses for the sake of it is never wise. Wait until you have learnt the basics of what focal length means and how it relates to the angle of view you get, before you start wasting your money on stuff you don't need. Have some patience, wait, and learn!

Good luck with your course.

Update: So you say you know about focal lengths, but you mentioned buying a wide angle lens and you didn't seem to know that 18mm is already wide angle. There's no way to recommend a lens without knowing which specific purpose you need it for. For example there's no point suggesting you need a long telephoto zoom, if you want to shoot landscapes, or building interiors, there's no point in suggesting you buy a 50mm f/1.8 if you want to shoot sports or wildlife.

Peter is this you?

Whoever told you to buy new lenses when you didn't know what the photographic needs were was either ill-informed or a poser, possibly both. Ignore the advice.