Ceramic knives are good for fruit cutting because the fruit like apples has acid and rests to a steel blade and turns brown after you cut it. Ceramic knives are also very sharp and very hard and brittle so you have to be careful.  The main downside is being so hard you can’t sharpen on the equipment you use for your steel knives.  But one of the best knife sharpener companies Zworksharp makes special sanding belts for their sharpeners.  I sent for them and they worked.   I had several ceramic knives that had chipped blades and some had broken points and I fixed them all.  If you don’t want to do this you can send them in to one company that sharpens their own brand Kyocera.   You can use them for regular parking knives and butcher knive just know that if you drop them on the floor they might chip or break to points.  I bought used knives by the dozens that were dull and had chips and broken points and taught myself how to fix them.  Most of the major knife companies will have a sharpening device and they used to be free you just paid postage to send it in. Now most want you to pay postage both ways and some charge for sharpening usually around $10. Or so.  If you are a vegan or vegetarian a ceramic knife is proplaly a good choice.   I haven’t seen a serrated one so you might need a steel bread knife.  Boker used to make a ceramic pocket knife not sure if they still do it looked like a nice knife.  Ceramic plates are what they use for heat shields on the belly of the space shuttle.  If you want to try one you can find generic ones usually from China  on line for around $20.0o for small to medium size parsing knives.  The Kyocera 7 inch chefs knife is around $70.00.