I was simply raised with the understanding that a knife was an essential tool that every man should carry and given my first pocket knife when I was about 10.
The older I get the more essential I believe knives are and that they should be carried by every adult.
The key is having a knife that is always acessible so I’m prone to carrying several.
For self defense I believe knives are even more essential than firearms and of course there are lots of places you can carry a knife but can’t carry a gun.
In the modern era we know have ceramic and plastic undetectable knives some of which are very small and very easy to conceal.
One thing I like to encourage is the carry of such knives where they can be accessed in any normal position or circumstance and even some that are neither.
You can for example easily find yourself in a scrape where your hands are pinned behind your back. Where is your knife?
There are many very small but still very effective plastic and ceramic knives that can easily be carried in the lining of your belt, shirt pocket, back pocket etc.
Here are a couple of great examples.
Having knives like these carried in places people don’t expect them to be found is a great way to enhance your survivabilty in many self defense situations.