The old saying "a dull Knife is a dangerous Knife" is true. Not only is a dull Knife dangerous, it's useless too.
Knives obviously have to be sharp to be any good, which means you need a good Knife Sharpener. What's the Best Knife Sharpener around? There are a lot of them. Find a Knife Sharpener that's easy to use, doesn't have a lot of moving parts, and is not fragile. Then learn how to Sharpen a Knife on it. Practice with a cheap Knife until you're proficient. A good Knife Sharpener will pay for itself 1000's of times over by keeping your Knives and other survival tools razor sharp, safe, and effective. For info on Knife Sharpening, go here > How to Sharpen a Survival Knife