Whetstones
Whetstone knife sharpening is by far the best method to sharpen your knives, but it takes time, practice, and skill to master. As with all abrasives, you’ll want to start with a lower-numbered (coarse) grit to remove steel and sharpen, and work your way up through the higher-numbered (finer) grits to fine-tune and clean up your edge. Many whetstones are “combination” whetstones, featured two grits that you can flip between.
Browse through some of the best whetstones from EdgeLogix and Shun, and start sharpening your knives like a professional.