>>1901942lansky puck has worked well for my axes, you want to maintain the convex edge
for knives pick up some budget japanese whetstones, king and suhiro come to mind, you need ~400 grit for chips and reprofiling, ~1000 for sharpening, and ~3000+ for polishing, add a strop with ~10k grit compound and you can get an absolute razor edge
get a knife you dont care about or one with a scandi grind (easiest edge to sharpen on whetstones) and practice how to freehand sharpen, once you get good at it theres no going back
