If you cook at home at all, a good Chef's Knife is the first thing you need. The proper use of this tool for all of its various purposes - chopping, dicing, slicing, etc. - are things to be learned. YouTube is a fine resource for learning knife skills.
Pictured is an 8" Wusthof.
I bring this up because last week we posted on the topic of Knife Control, and were reminded about docs in the UK: British Doctors Call for Ban on Long Kitchen Knives to End Stabbings.
Next, it will be a ban on knitting needles.