If you had a full frame camera with a 50mm lens on, and your APS-C sensor D3300 with a 35mm lens on side by side, you will get a very similar field of view.
If you then put the 50mm lens on your D3300, you would need to put a 75mm lens on the full frame camera to get a similar view of view.
This is all well and good if you're used to using a full frame camera with a 50mm lens on, but if you aren't then it doesn't mean an awful lot to you. The good news is that it doesn't necessarily have to, do you currently have any lenses, perhaps an 18-55mm kit lens? If so try zooming to 35 and take a picture, then zoom to 50 and take a picture. Compare the 2 and see if you'd prefer the 35 or the 50. There's not really an awful lot more to it than that.
If you don't mind me asking, what is it that originally made you want a 50mm lens? If its because 50mm is often referred to as close to the human eye, this tends to harp back to the days of 135 film which is the same size as having a full frame sensor now (and therefore still rings true if you have a full frame camera). If you're using a smaller sensor, a wider angle is required for the same view, hence the 35mm lens being popular among people with crop sensor cameras.
The good news is that Nikon make a great little 35mm 1.8 lens for not a great amount of money. You'll only need the cheaper DX version for your camera. If you still want the 50mm lens, you need to make sure you get an AF-S version and not the AF-D version. The AF-D version will take photographs on your camera but will be manual focus only.