What kind of macro lense to buy for a beginner?

I have a nikon d3300. I mainly focus on bird photography but i would also like to try macro photography. I'm still pretty new to this so i need help finding the right lenses.

I would like to get a macro lense that isn't very expensive, since i don't know how much i will be using it. So i need some recommendations on good but not expensive macro lenses for nikon d3300.

Thanks!

Added (1). Guys, if the first answer got so many thumbs down (unless my account is gliching and there arent that many) please suggest other lenses. If that one is a bad lense, I don't know what i'm supposed to do next.

The Sigma 50mm f2.8 is a very good macro lens.

When getting a macro lens, consider the distance you will be shooting from and the level of magnification you want to achieve. Ideally, that's the nearest possible with at least 1:1 ratio.

The best Nikon macro lenses to start with, in my and I would think most photogs' opinions would be either the

55mm 2.8 Micro AIS (Nikon calls macro lenses Micro):

https://www.keh.com/shop/nikon-nikkor-55-mm-f-2-8-fixed-focal-length-lens-for-nikon-f.html

or if you need something cheaper, their 55mm 3.5 Micro AI:

https://www.keh.com/shop/nikon-55mm-f-3-5-micro-ai-manual-focus-lens-52.html

With these earlier style manual focus lenses, you will not have auto focus (of course) or metering on the D3300. However, they are of higher optical quality and a competitive used price than something like the aforementioned, all plastic barrel, plastic-molded glass elment Sigma 50mm 2.8 Macro (which is of fine enough quality but not a the Nikkor level):

https://www.keh.com/shop/sigma-50mm-f-2-8-macro-ais-manual-focus-lens-for-nikon-52-685103.html

Note that the Nikkor 55mm 2.8 AIS Micro is also available new at nearly $400, so that should give you an idea the quality of this lens and the deal you're getting buying it used:

http://www.bhphotovideo.com/...Micro.html

If you feel you can't live without metering or auto focus, there's also the Nikkor 40mm 2.8 G AFS:

http://www.bhphotovideo.com/..._AF_S.html

With macro, auto focus, to me, is kind of a waste of money unless you plan on using the lens as a normal shooting lens too and absolutely want auto focus for that. Metering would be nice but also not necessary for macro photography. A good all manual lens will teach you the discipline required to do good macro photography. And you'll be buying a more reliable, universal lens where your money goes towards optical quality rather than unnecessary features.

Since the D3300 is an APS-C camera, meaning its sensor is not full frame, all these lenses will be about 1.5 times their focal length. If you move up to a full frame camera at any point, these lenses will all still be compatible. If you just buy a DX (non full frame) zoom lens which could be cheaper, your optical quality will suffer and you will not be making an investment in a lens that you can use in the future as your photography grows.

Here's a shot that I took using just the Nikkor 55mm 3.5 Micro pre-AI (even cheaper than the one I recommended above but not compatible with your camera. Notice that the resolution is ridiculously high and this is on 35mm film also.

So as you can see, these old manual focus Nikkors are really nice.

Best of luck, happy shooting and please remember to choose a best answer!