The best way to hold the Chef’s knife is the one which helps to maintain comfort, control and safety as well as to minimize fatigue.

Hold the knife around its bolster. The bolster functions both as your knife‚s balance point and as the guard of your finger. Rest your last three fingers on the handle. Your thumb and index fin-ger should be on opposite sides of the blade. When you hold a
knife around its balance point, it works as an extension of your hand. Thus your arm doesn’t tire and you have an excellent control.

Understanding Cutlery How To Hold A Knife Maintaining A Knife's Edge
Sharpening Knife Shapes & Uses Slicing & Chopping
  Chopping & Slicing Terms