I own a 18-55 kit lens for my Nikon D3300. i plan to sell it and buy a 35mm 1.8 prime lens. will it worth. i think there is no much difference in focal range of the both
The key difference between these two lenses is the fact that one is a zoom lens, and the other is a prime lens. Prime lenses usually offer better optical performance, at the same focal lengths, than a zoom lens.
The aperture is denoted by the f-number, and the 35 has a larger aperture, denoted by it's smaller f-number, i.e., 1.8.
A larger aperture gives you the creamy bokeh that successfully isolates the subject from the background, and is also very aesthetic, like this. This was shot by Brandon Woelfel on Instagram.
On a Nikon D3300, which has an APS-C sensor, you would get the equivalent of 52 mm, not 35, which is perfect for daily use, street photography, and the casual video shoot too. This is because APS-C sensors in Nikon cameras have a crop factor of 1.5x.
I have the 35mm too, and it is fantastic. You should definitely go for it.