What can sharpen a woodworking chisel?

It must be noted that the front is flat.

See how big the chisel is when grinding. Generally, it starts with a 240-mesh millstone, followed by 400,600,800. After grinding, try to see if there is any flash by hand (that is, feel the curling with your thumb and experience it yourself). If there is flash, replace it with the next mesh grindstone or sandpaper. When grinding, don't point your tough mouth at the grindstone, but pull it back. After 800, you basically don't need to grind, and then you start grinding. Generally, you use the inside of the cowhide belt to grind along the tough direction. Just polish it to a mirror effect.