How To Dice An Onion
There is probably no more fundamental knife skill than dicing an onion. Onions are an ingredient in so many dishes that mastering this skill will make your cooking life much easier. This video below is from the great people at Wusthof and it shows the classic technique for dicing an onion.
I will admit that I do not do the horizontal cut that is shown here and my dice comes out perfectly. But it is traditional to include the horizontal cut. You can try it either way and see what works best for you.