It's a fancy way of saying "please indulge me in what I'm saying". It can have a few meanings but in this case, it's the speaker acknowledging that they're unsure what to call their methods. So they're saying if you will just indulge them in saying techniques or skills. You might see this when someone is asking you to imagine something specific. It's a little dramatic. "Imagine, if you will, a glorious sunset..." In other words, indulge me in picturing this scene in your mind.

"If you will" is sometimes used when youre rephrasing something. "Five techniques" and "five skills" mean the same thing, and the speaker is pointing out that they're using a different (maybe better) expression or word to express the same idea. You don't typically use "if you want" in this way.