Holding the knife solely by the handle isn't dangerous and seems logical, but it lacks precision, while professional chefs typically grip the blade itself with thumb and forefinger on either side.
Gordon Ramsay has made one thing crystal clear across every season of Hell's Kitchen: your knife skills either make you or break you in the kitchen. From the very first episode to the final dinner ...
But a good kitchen knife is only worth the cost of admission if you properly care for it and there's definitely a learning curve. I am, admittedly, the pot calling the kettle black. I've ruined plenty ...