You will also need at least one finer stone. Once the shape of an edge is established, successively finer grits are used to refine the edge improving the quality of the cut it delivers. A dull edge will not cut well and should be shaped with a coarse stone. An edge sharpened on a coarse stone will cut better than a dull one, but still won’t be ideal and should be improved with a finer stone. As you progress through finer stones, the cutting edge will continue to improve. How many and how fine these stones need to be varies depending on how fine an edge you require.
For example, with Waterstones, they will need to be soaked in water before you use them. Most manufacturers will recommend you do this for at least 10 minutes, in tepid water. When you leave them in water, you will notice that bubbles will begin to rise to the surface, just for your information. As for oil-based stones, these need to be lubricated with some sort of oil. Now, it is advised to avoid cooking oils such as vegetable and olive oil. When doing so, also remember that a little goes a long way. You will only need to apply a small line of oil and simply spread it in afterward.
I'm not sure what the purpose of the extra white stone is - it says it is to flatten, but IMHO it is not a great idea to flatten the stones with something that small. I have a separate diamond lapping plate with a large surface area that I use to flatten the stones. It might be useful for sharpening awkward edges, like scissors and secateurs, though!
As you probably have guessed, knives are easier to sharpen on longer stones. The width of the stone is less important than the length when sharpening knives. The longer stone allows for longer sharpening strokes and contributes to faster sharpening. The longer strokes mean fewer strokes across your stone, making it easier to maintain a consistent sharpening angle. As a rule of thumb, a small knife can easily be sharpened on a large stone, but a large knife cannot easily be sharpened on a small stone.

Selecting the right sharpening angle is the next step in sharpening. For more detailed instructions on selecting the right angle, try reading this article. Regardless of the method of sharpening, a appropriate angle should be selected. This angle doesn't need to be exact but following some general guidelines is a good idea. Most knife manufacturers recommend a roughly 20 degree angle. Depending on the use of your knife, you can move up or down from that angle. A fillet or slicing knife is never used on anything hard so an angle a few degrees less will produce a sharper edge. On the other hand, a survival knife with various uses can benefit from a more durable edge a few degrees larger.

The goal when sharpening is to create a burr, which is a tiny whisper of metal left on one side of the blade. You'll know you have a burr when you can feel one smooth and one scratchy side to the edge. Warner's is formed in no time at all; I struggled. Nevertheless, eventually I got there. Once you've got the burr, it's time to move on to step three.
This is an important but often confusing aspect of the sharpening process. When you sharpen knives, especially on coarser stones, you'll notice a burr form on the opposite side of the edge. It can be difficult to see, but easy to feel. Carefully feel for the burr by running your finger from the spine of the knife to the edge. The burr will jump from side to side as you sharpen each edge, and once you've felt the burr move to both sides, you can move to the next finer stone. Once you get to the finest grit, the burr will become smaller and smaller!
A sharpening stone is the easiest way to return your knives and other cutlery to a useful state once they begin to dull. Not only knives but also scissors, razors, chisels, and plane blades can be sharpened with a stone. Sharpening stones are made of very hard stone or a manufactured material, such as ceramic or diamond stone. Usually in the form of a block that you hold in your hand or set on a flat surface, although they can also be found in the form of bench stones, wheels, or rods, these blocks are also called whetstones or waterstones.
2. Although I’ve been sharpening knives for a while, I never could get a knife sharp using the freehand method, I’ve had to rely on various jigs to set & maintain a constant angle to the bevel. To begin with, the Lanksy knife sharpener kit was my main tool, but then I found a South African jig made by Warthog Knife Sharpeners. I still have their first model, which, if memory serves me, came out in the late 1990’s. This has since been upgraded & is supplied with a diamond stone, which is worthless unless it’s going to be used for ceramic knives. However-the Warthog & the Warthog Multi-Blade’s modus operandi has the knife moving ABOVE the stone, unlike the Lanksy / Edge Pro / Edge Pro Chinese copies & variants. ( No oil / water dripping off the stone from above the knife). Also, the Warthogs use any bench-size whetstone available to its owner, a very big plus if you want to use your grand-dad’s old Arkansas stone.No tie in having to buy the manufacturer’s specialised stones which work only with one type of sharpening jig.
Contrary to popular belief, the whetstone is not called so because it is soaked in water prior to sharpening. To whet an object means to sharpen; the soaking step aids in priming the stone for sharpening. The process of sharpening a blade with a whetstone is aptly called stoning. The water combines with the small particles in the stone to create an abrasive surface to grind the blade.
The size of the sharpening stone is a factor to consider before purchasing. The size of your tools determines the size of the stone. If you need a stone for kitchen knives, then a 6-inch stone is good but will not be as effective on larger blades. An 8-12 inch stone is safe to use on hand tools and larger blades. There are pocket size stones that you can carry around. It is crucial for the sharpening stone to be wider than the blade.
The Sharpening and Specialty lines of waterstones from Naniwa are available in several packages of three to five stones. The Specialty line is the same as the Sharpening line, but half the thickness and therefore less expensive. Both the Sharpening and the Specialty stones are 8 1/4" long by 2 3/4" wide, amply sized for most knives and tools. These are a higher grade stone that do not require soaking before use. While you would need a flattening stone in addition, these kits are a good way to enter into premium grade waterstones.
While it may still feel like there is a lot to choose from, you don’t need a lot of of stones, you just a several good varieties to choose from. To summarize I will indicate below what my favourite stones are in each grit. Yes you can mix up the brands when sharpening but my recommendation is to buy a combination of 2-3 stones of the same brand and go from there.
This pocket-size Lansky dual grit has a coarse 120 grit side and a medium 280 grit side. The unique tool is ideal for sharpening a wide variety of blades. The Puck’s contoured shape is very much grip-able and provides enough safety while you do your tool sharpening. Its coarse side provides quick cutting and shaping, and the medium side will help to get the final finishing of the edge.
The stone should be durable: avoid knockoff models that are chipped or cracked. This is a serious concern when purchasing online, especially overseas. A quality whetstone should last a lifetime, and the price offered is a steal compared to the value. You may never have to replace expensive blades if you can simply sharpen a dull edge, and the stone pays for itself after only a few uses.
When the block is intended for installation on a bench it is called a bench stone. Small, portable stones (commonly made of bonded abrasive) are called pocket stones. Being smaller, they are more portable than bench stones but present difficulty in maintaining a consistent angle and pressure when drawing the stone along larger blades. However, they still can form a good edge. Frequently, fine grained pocket stones are used for honing, especially "in the field". Despite being a homophone with wet in most dialects of modern English, whetstones do not need to be lubricated with oil or water, although it is very common to do so. Lubrication aids the cutting action and carries swarf away.