and don't try and stop by using your legs on the back wheel unless and until you've become a proper trick cyclist, like some mentioned above, you will likely end up in the hedge / under a bus.
Also don't forget it's fixed and inadvertently ease off / try and freewheel either. I tried this on delivery day of mine coming up to the traffic lights in the Strand. First time for 30 years on a fixie (and only once then), new bike, never cycled in London before - what could possibly go wrong ? Got away with that, and never made the mistake again. Got sufficiently confident on that first ride to try a track-stand later - but that was indeed a hubris & nemesis moment - oh well.
Still got it and love it, despite being middle aged, not that fit, and living in a hilly city (Bristol) - highly recommended