For me, and a lot of other people, voltage dividers are the single most important concept in all of practical analog electronics. This whole first section concludes with designing and explaining the inner workings of a volume knob, which is ultimately not much more than a voltage divider with music or audio plugged into it.

If you continue with electronics past this foundational material you're doing right now, you'll see that not only are these in virtually everything, but that a surprising number of important audio circuits which do not outwardly appear to be voltage dividers, can best be understood as voltage dividers.

In the video below I encourage you to follow along. You don't have to use the same exact resistors I do, but both to be safe (from burning yourself and your resistors) and to not needlessly waste electrons, I'd say make sure the sum of your resistors in series is at least around 10k.

Ok I said in the video "why don't you go and plug in some different resistors and do the math and see it working", but I've also recorded myself doing the same, should you be unsure whether you're doing it right.

Here is a more complex voltage divider with three resistors. You can follow along and build and measure if you'd like, but at the very least, watch and make sure you generally understand what happens when there's more than two resistors in the circuit.