A quality Nikon camera under $300?

So I saw I was really interested in doing photography lately on my iPhone 5s and I wanted to do something more practical than taking them on a phone. I was looking at Nikon cameras which I prefer over any other, I also want really nice HD pics with lots of cool filters and effects, I'm not crazy about having the best zoom in the world but quality zoom is preferred, and I want one with lots of space for pics AND video. I do want one preferably under $300 and over $270 is a bit much for the budget I have but please help I don't have experience with cameras much🙈

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Will a Sigma 10-20mm lens fit on my Nikon d3100 body?

Tossing up whether to buy a Sigma 10-20 lens OR Tokina 11-16 lens, and whether it will fit my camera body. Do I need an adapter ring for it to fit to my body?

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How to go into my settings to use the zoom on my D5200 Nikon with 18-55mm lens?

How do I go into my settings to use the zoom on my D5200 Nikon with 18-55mm lens?

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