Simplest way may not be the easiest.
I'd say the simplest way is to rub it on a stone at a constant angle.
Easiest way is to use a jig that will hold the angle for you so you have one less thing to worry about.
Every jig I've seen has some limitations, so what you want to sharpen will influence which is best for you.
IMO understanding what makes an edge sharp, and why edges fail will be the key to getting the best from your edges