I flat grind and hollow grind. And I use a jig now. Have been grinding for 35 years and I wished I had started using a jig 35 years ago. My grinds were always very good because I worked at it. But now they are darn near perfect. When I got in the Guild it was preached that you should only grind by hand. Baloney. I have been told that you are not a knife maker if you can't grind freehand. My customers don't care if my grinds are done freehand or not. They just want a good knife. I can still freehand and I do when it is something that I can do quick. But using a jig the grinds are a lot better. The point here is to learn to grind the way you want to. There is nothing wrong with how you make a knife your way.