That is literally it! You can build this in 5 minutes.
alright, so we have our stuff. this is a circuit i found that is really simple.
take a look at this and then i'll explain it a bit, but wont go into theory too much.
So, theres 3 pins on the transistor (thing with the arrow on it)
most npn transistors if you look at them face-on (flat side facing you), the pins go left-to-right: collector, base, emitter.
always double check the transistor though with a search online though for the pinout.
The capactiors arent even super necessary, they just ensure that you dont get DC voltage and instead get only audio signal
so, what the result of this will be is that ur input comes out, but way louder.
this is due to transistors being magical.
The diodes at the right side of the diagram "clip" the signal which is what makes it be a distortion instead of just a gain pedal!
There you go! you are done! you can mess around by adding some passive filters,
or stringing together several of this same circuit to get really extreme distortion
you can mess around with feeding the circuit back into itself in different ways,
all kinds of stuff. from here on out, you know how to make an amplifier and a clipper, so the world is yours!