I have a large knife collection. Some are collectors (mint pre-1990 Case folders) some more modern (Emerson. Benchmade, Spyderco, Cold Steel, Busse, Kellam, Ahti, Marttiini, Roselli). Blade shape sort of determines the optimal sharpening method. However for a beginner I would avoid anyththat is powered. It is too easy to do too much and do more harm than good. A cheap but very good sharpening system is the lowly crock sticks. A wood block with 2 or 4 angled holes and 2 or 4 round ceramic rods. You only need to hold the knife with the blade vertical and let just the edge slide down the rod while moving down and back at the same time. Sounds complicated but it is simple. YouTube has videos. A set of crock stick is cheap and very effective. Just make sure the rods are generally straight and have no defects. In general the grey rids are rougher and the white ones are smoother. I will use a little bit of adhesive paper label to make sure the kids if snug in the base. As metal builds up on the rod rotate it a slight amount. The rods can be cleaned with stove top cleaner and rinsed under water. Ebay can be a good source for some crock sticks (under $20). The longer ones are easier to use. Good luck.