Most of the time, if you’re DJing modern music, Traktor will automatically align the grid correctly. There are times though, when Traktor gets it wrong and you have to readjust the grid yourself.
Reveal the advanced deck options and click on the Grid tab. Here you can create and delete grid markers, fine adjust the bpm, tap tempo, reset any changes and move the grid markers currently in place.
Use the waveform zoom to make your grid adjustments as accurate as possible - this is accessed via the plus and minus symbols to the left of the pitch fader.
Pro tip: If you use Traktor DJ for iOS, you can use your iDevice to re-align grids and sync the result via Dropbox. Getting hands on with a touch-screen device is much easier than using the much smaller and complex controls in Traktor Pro.