This article is not about how to sharpen a knife, check this article instead, but briefly, a coarse stone is critical, it has the potential to raise a Burr quickly and make a dull knife sharp quickly. The correct use of pressure enables us to form a burr, remove the burr and then do some coarse stone refinement and thus create a very sharp knife. This sensation is motivation, it is a confidence builder and will enhance your sharpening experience, so believe me when I say that a coarse stone is your first priority. I recommend a 400, 600 or 800 grit. After that, depending on the knives you are sharpening strive to obtain stone combination, such as a 400 – 1,000 – 5,000 grit three stone combination is going to allow you to achieve knives sharper than most people have ever seen.

Ye olde tomato test - After you have sharpened using one of the above sharpeners grab a firm tomato and try to slice it. If the blade is properly sharpened it will slice through the skin with virtually no effort and without pushing the skin inward first. If the skin is able to fight back against the blade then your knives are not properly sharpened yet.

But it's a different type of sharp, according to Joe Authbert, product development manager at ProCook. "What it does is add tiny little micro-serrations onto the edge of the blade." But fear not - your smart knife won't end up looking like a bread knife, as you'll be hard-pressed to spot the serrations. "If you looked at it under a microscope, on the cutting edge, there are these little lines that generate the sharpness, rather than a waterstone which is a smooth sharp edge," says Authbert. 
This was the first Whetstone that I've ever purchased. After reviewing several 'how-to' videos, I jumped right in to use it. I found the process nearly meditative and the BearMoo stone extremely effective! The first knife I sharpened was very dull with small, jagged edges. The 1000 grit side effectively removed the jagged indentations and created a nice cutting edge. The 4000 grit side made the knife razor sharp. The process took nearly 40-minutes.
This is a good size stone and has the two different grits needed for knife sharpening. No instructions were included, but there are many websites with written and video instructions, so this is not an issue for most people. A fair amount of dust is generated during the sharpening process, so protect the work surface and wash the knife after sharpening is completed.
Diamond plates are available in various plate sizes (from credit card to bench plate size) and grades of grit. A coarser grit is used to remove larger amounts of metal more rapidly, such as when forming an edge or restoring a damaged edge. A finer grit is used to remove the scratches of larger grits and to refine an edge. There are two-sided plates with each side coated with a different grit.[14]